Ion Implantation Defined Nanorods in Suspended Majorana Fermion Devices

Abstract

A device, system, method, computer-implemented method, apparatus, or computer program product, or combination thereof, is provided that can enable a suspended Majorana fermion device including ion-implanted nanorods in a semiconductor device. According to one embodiment, a quantum computing device can include a Majorana fermion device coupled to the ion-implanted region. The quantum computing device can further include an encapsulation membrane coupled to the ion-implanted region and the substrate layer. The encapsulation membrane suspends the Majorana fermion device in the quantum computing device.

Description

[Technical field]

[0001] The present disclosure relates to Majorana fermion devices and methods for forming the same, and more particularly, to ion implantation defining nanorods in suspended Majorana fermion devices and methods for forming the same. Summary of the Invention

[0002] The following presents a summary to provide a basic understanding of one or more embodiments of the invention. This summary is not intended to identify key or critical elements or to delineate the scope of particular embodiments or the claims. Its sole purpose is to present concepts in a simplified form as a prelude to the more detailed description that is presented later. In one or more embodiments described herein, a device, system, method, computer-implemented method, apparatus, or computer program product, or combination thereof, is described that enables suspended Majorana fermion devices including ion-implanted defined nanorods in semiconductor devices.

[0003] According to one embodiment, a quantum computing device may include a Majorana fermion device coupled to the ion implanted region. The quantum computing device may further include an encapsulation membrane coupled to the ion implanted region and the substrate layer. The encapsulation membrane suspends the Majorana fermion device in the quantum computing device.

[0004] According to one embodiment, a method can include forming an ion implanted region coupled to a Majorana fermion device in a quantum computing device. The method can further include forming an encapsulation membrane coupled to the ion implanted region and a substrate layer to suspend the Majorana fermion device in the quantum computing device.

[0005] According to one embodiment, a device can include a Majorana Fermion device including ion-implanted defined nanorods. The device can further include a superconducting layer coupled to the ion-implanted defined nanorods. [Brief description of the drawings]

[0006] [Figure 1] FIG. 2 is a cross-sectional side view of an example, non-limiting device that can include multiple semiconductor layers formed on a substrate layer according to one or more embodiments described herein. [Diagram 2] 2 is a cross-sectional side view of the example non-limiting device of FIG. 1 after forming a superconducting layer according to one or more embodiments described herein. [Diagram 3] 3A and 3B are top and cross-sectional views, respectively, of the example, non-limiting device of FIG. 2 after forming a first resist layer according to one or more embodiments described herein. [Figure 4] (A) and (B) are top and cross-sectional views, respectively, of the example non-limiting devices of Figures 3A and 3B after an ion implantation process has been performed to form ion implantation-defined nanorods and ion implantation-defined sensing regions according to one or more embodiments described herein. [Diagram 5] 4A and 4B are top and cross-sectional views, respectively, of the example non-limiting device of FIG. 4A and FIG. 4B after performing a wet etching process to remove a portion of the superconducting layer, according to one or more embodiments described herein. [Figure 6] (A) and (B) are top and cross-sectional views, respectively, of the example, non-limiting device of Figures 5A and 5B after forming a second resist layer on or around the first resist layer, or both, according to one or more embodiments described herein. [Figure 7]6A and 6B are top and cross-sectional views, respectively, of the example non-limiting device of FIGS. 6A and 6B after performing a wet etching process to remove portions of the superconducting layer from the ion implantation-defined nanorods and after stripping the first and second resist layers according to one or more embodiments described herein. [Figure 8] 7A and 7B are top and cross-sectional views, respectively, of the example, non-limiting device of FIG. 7A and FIG. 7B after forming a resist layer according to one or more embodiments described herein. [Figure 9] 8A and 8B are top and cross-sectional views, respectively, of the example non-limiting devices of FIGS. 8A and 8B after performing a wet etching process to remove a portion of the superconducting layer from the semiconductor layer, according to one or more embodiments described herein. [Figure 10] 9A and 9B are top and cross-sectional views, respectively, of the example non-limiting device of FIG. 9A and FIG. 9B after stripping the resist layer, according to one or more embodiments described herein. [Figure 11] 10A and 10B are top and cross-sectional views, respectively, of the example, non-limiting device of FIG. 10A and FIG. 10B after forming a resist layer according to one or more embodiments described herein. [Figure 12] (A) and (B) are top and cross-sectional views, respectively, of the example non-limiting device of Figures 11A and 11B after depositing a metal layer to form one or more wires according to one or more embodiments described herein. [Figure 13] (A) and (B) are top and cross-sectional views, respectively, of the example non-limiting device of Figures 12A and 12B after removing the resist layer and / or metal layer according to one or more embodiments described herein. [Figure 14]13A and 13B are top and cross-sectional views, respectively, of the exemplary non-limiting device of FIG. 13A and FIG. 13B after forming an encapsulation membrane according to one or more embodiments described herein. [Figure 15] (A) and (B) are top and cross-sectional views, respectively, of the exemplary non-limiting device of Figures 14A and 14B after bonding a second substrate layer to the encapsulation membrane according to one or more embodiments described herein. [Figure 16] 15A and 15B are top and cross-sectional views, respectively, of the exemplary non-limiting device of FIG. 15A and FIG. 15B after removal of the substrate layer, according to one or more embodiments described herein. [Figure 17] 16A and 16B are top and cross-sectional views, respectively, of the example non-limiting device of FIG. 16A and FIG. 16B after removing the semiconductor layer, according to one or more embodiments described herein. [Figure 18] 17A and 17B are top and cross-sectional views, respectively, of the exemplary non-limiting device of FIG. 17A and FIG. 17B after spinning and forming a resist layer according to one or more embodiments described herein. [Figure 19] 18A and 18B are top and cross-sectional views, respectively, of the example, non-limiting device of FIG. 18A and FIG. 18B after depositing a metal layer to form one or more wires according to one or more embodiments described herein. [Figure 20] (A) and (B) are top and cross-sectional views, respectively, of the example non-limiting device of Figures 19A and 19B after removing the resist layer and metal layer according to one or more embodiments described herein. [Figure 21] (A) and (B) are top and cross-sectional views, respectively, of the exemplary non-limiting device of Figures 20A and 20B after removing one or more portions of the ion-implanted region from the encapsulation membrane to form one or more openings, according to one or more embodiments described herein. [Figure 22]21A and 21B are top and cross-sectional views, respectively, of the example non-limiting device of FIG. 21A and FIG. 21B after removing one or more portions of the encapsulation membrane to form one or more hollow spaces and suspended Majorana fermion devices according to one or more embodiments described herein. [Figure 23] (A) and (B) are top and cross-sectional views, respectively, of the exemplary non-limiting device of Figures 21A and 21B after removing one or more portions of the encapsulation film and depositing one or more metal pads according to one or more embodiments described herein. [Figure 24] FIG. 1 is a top view of an example non-limiting device that can enable a suspended Majorana fermion device including ion implantation defined nanorods in a semiconductor device according to one or more embodiments described herein. [Diagram 25] 1 is a flow diagram of an example non-limiting method that can facilitate implementing a suspended Majorana fermion device including ion implantation defined nanorods in a semiconductor device according to one or more embodiments described herein. [Figure 26] FIG. 1 is a block diagram of an example non-limiting operating environment in which one or more embodiments described herein can be enabled. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0007] The following detailed description is merely illustrative and is not intended to limit the embodiments or the application and / or uses of the embodiments, nor is there any intention to be bound by any express or implied information presented in the preceding "Technical Field" or "Summary" sections or in the "Description of the Preferred Embodiments" section.

[0008] One or more embodiments will now be described with reference to the drawings, in which like reference numerals are used to refer to like elements throughout. In the following description, for purposes of explanation, numerous specific details are set forth to provide a more complete understanding of one or more embodiments. However, it will be apparent that in various instances, one or more embodiments may be practiced without these specific details. It should be noted that the drawings in this application are provided merely for illustration purposes, and therefore the drawings are not drawn to scale.

[0009] Some existing quantum computing techniques attempt to incorporate Majorana fermion quantum phenomena to exploit the potential benefits of Majorana fermions. Majorana fermions (also called Majorana particles (quasiparticles)) are fermions that have the property of being their own antiparticles. Majorana fermion devices (e.g., Majorana fermion-based devices) can include structures of semiconductor and / or superconducting materials that can mimic Majorana fermions and / or facilitate the measurement of observables that can be properties (e.g., behavior, function, properties, etc.) of Majorana fermions. For example, at the interface of a semiconductor nanorod and a superconducting material, one can observe superconducting behavior at the surface of a semiconductor nanorod that mimics the properties of Majorana fermions.

[0010] The Majorana fermion devices described above can be realized as quantum devices and / or Majorana qubits in quantum computing devices. Such quantum devices and / or Majorana qubits offer the possibility of quantum computing with long coherence times and / or fast and possibly universal quantum computing. However, given the delicate nature of Majorana fermions, it is very challenging to fabricate effective and / or robust Majorana fermion devices that can mimic Majorana fermions using existing semiconductor and / or superconductor fabrication techniques. Some examples of such challenges may include:

[0011] a) Fabrication of very high quality interfaces and membranes.

[0012] b) Conventional processing (e.g., reactive ion etching (RIE), cleaning, air oxidation, etc.) damages the film.

[0013] c) Dielectrics quench coherence, so a challenge is to fabricate wiring structures without a dielectric film separating the structures (e.g., wiring structures can trap charge and give rise to quasiparticles, which can result in uncontrolled electron density).

[0014] d) Integrating multiple elements to create a Majorana fermion device that behaves like a Majorana fermion, such as integrating a nanorod (e.g., a III-V semiconductor nanorod such as indium arsenide (InAs)) contacting a superconductor (e.g., aluminum (Al)), a sensing region (e.g., a quantum dot structure near the nanorod), a tunnel junction gate (e.g., to control the interaction between the quantum dot structure and the nanorod), a chemical potential control gate (e.g., to change the chemical potential of the nanorod by changing the voltage to the gate to help set the nanorod at the zero energy point required to mimic Majorana fermion properties), contacts and circuit wires, semiconductor connections for the sensing region, or other elements, or combinations thereof.

[0015] 1-24 illustrate an exemplary, non-limiting, multi-step fabrication procedure that may be implemented to fabricate one or more embodiments of the present disclosure described herein and / or illustrated in the figures. For example, the non-limiting multi-step fabrication sequence illustrated in FIGs. 1-24 may be implemented to fabricate a suspended Majorana Fermion device including one or more ion-implanted defined nanorods in a semiconductor device. For example, according to one or more embodiments described herein, the non-limiting multi-step fabrication sequence illustrated in FIGs. 1-24 may be implemented to fabricate devices 100-2400, where devices 100-2100 and / or 2300 may be expanded into devices 2200 and / or 2400, as described below. Device 2200 and / or 2400 may include a quantum computing device (e.g., quantum circuit, quantum hardware, quantum processor, quantum computer, etc.) including one or more Majorana fermion devices 2206 having one or more ion-implanted defined nanorods 406 (e.g., such as those shown in Figures 22A, 22B, 24A, and 24B), where Majorana fermion devices 2206 may include suspended Majorana fermion devices. In one example, device 2200 may include Majorana fermion devices 2206 that may be implemented in device 2400 as Majorana qubits, and device 2400 may comprise a quantum processor.

[0016] As described below with reference to Figures 1-24, fabrication of various embodiments of the present disclosure described herein and / or illustrated in the figures (e.g., device 2200, Majorana fermion device 2206, ion implantation defined nanorod 406, etc.) can include a multi-step sequence of photolithographic and / or chemical processing steps that facilitate the step-by-step creation of an electronic-based system, device, component, or circuit, or combination thereof, in, for example, a semiconductor device (e.g., an integrated circuit). For example, various embodiments of the present disclosure (e.g., device 2200, Majorana fermion device 2206, ion implantation defined nanorods 406, etc.) described herein and / or illustrated in the figures may be fabricated using techniques that include, but are not limited to, photolithography, microlithography, nanolithography, nanoimprint lithography, photomasking techniques, patterning techniques, photoresist techniques (e.g., positive tone photoresist, negative tone photoresist, hybrid tone photoresist, etc.), etching techniques (e.g., reactive ion etching (RIE), etc.), and / or other techniques that may be used to fabricate the nanorods. ), dry etching, wet etching, ion beam etching, plasma etching, laser ablation, etc.), evaporation techniques, sputtering techniques, plasma ashing techniques, thermal treatments (e.g., rapid thermal annealing, furnace annealing, thermal oxidation, etc.), chemical vapor deposition (CVD), atomic layer deposition (ALD), physical vapor deposition (PVD), molecular beam epitaxy (MBE), electrochemical deposition (ECD), chemical mechanical planarization (CMP), backgrinding techniques, or another technique, or a combination thereof, for fabricating integrated circuits.

[0017] As described below with reference to Figures 1-24, the fabrication of the various embodiments of the present disclosure described herein and / or illustrated in the figures (e.g., device 2200, Majorana fermion device 2206, ion implanted defined nanorod 406, etc.) can be fabricated using a variety of materials. For example, the various embodiments of the present disclosure described herein and / or illustrated in the figures (e.g., device 2200, Majorana fermion device 2206, ion implanted defined nanorod 406, etc.) can be fabricated using one or more different types of materials, including, but not limited to, conductive materials, semiconductor materials, superconducting materials, dielectric materials, polymeric materials, organic materials, inorganic materials, non-conductive materials, or other materials that can be utilized in one or more of the techniques described above to fabricate integrated circuits, or combinations thereof.

[0018] When an element, as a layer (also called a film), region, or substrate, or combination thereof, is referred to as being "on" or "above" another element, it will be understood that it may be directly on the other element, or that intervening elements may further be present. In contrast, when an element is referred to as being "directly on" or "directly above" another element, there are no intervening elements. When an element is referred to as being "under" or "below" another element, it will also be understood that it may be directly below or below the other element, or that intervening elements may be present. In contrast, when an element is referred to as being "directly under" or "directly below" another element, there are no intervening elements. When an element is referred to as being "coupled" to another element, it will also be understood that this can describe one or more different types of coupling, including, but not limited to, chemical coupling, communicative coupling, electrical coupling, physical coupling, functional coupling, optical coupling, thermal coupling, or another type of coupling, or a combination thereof.

[0019] 1 is a cross-sectional side view of an exemplary, non-limiting device 100 that may include multiple semiconductor layers formed on a substrate layer according to one or more embodiments described herein. Device 100 may include one or more III-V semiconductor compound layers formed on a substrate layer, as described below.

[0020] The device 100 can include a substrate layer 102. The substrate layer 102 can include any material having semiconducting properties, including, but not limited to, silicon (Si), sapphire (e.g., aluminum oxide (Al2O3)), silicon-germanium (SiGe), silicon-germanium-carbon (SiGeC), silicon carbide (SiC), germanium (Ge) alloys, III / V compound semiconductors, II / VI compound semiconductors, or another material, or a combination thereof. In some embodiments, the substrate layer 102 can include a layered semiconductor, including, but not limited to, silicon / silicon-germanium (Si / SiGe), silicon / silicon carbide (Si / SiC), silicon-on-insulator (SOI), silicon-germanium-on-insulator (SGOI), or another layered semiconductor, or a combination thereof. The substrate layer 102 can include a thickness ranging from about 200 micrometers (μm) to about 750 μm.

[0021] The device 100 may further include a first group III-V semiconductor compound layer 104 (referred to herein as the first group III-V layer 104) formed on the substrate layer 102. The first group III-V layer 104 may include a group III-V semiconductor compound, including, but not limited to, indium aluminum arsenide (InAlAs) or another group III-V semiconductor compound, or both. The first group III-V layer 104 may be formed on the substrate 102 using one or more deposition processes, including, but not limited to, PVD, CVD, ALD, PECVD, spin-on coating, sputtering, or another deposition process, or a combination thereof. In one embodiment, the first group III-V layer 104 may include a buffer layer. In another embodiment, the first group III-V layer 104 may have a thickness (e.g., height) ranging from about 200 nanometers (nm) to about 2 μm.

[0022] The device 100 may further include one or more additional III-V semiconductor compound layers, which may include one or more epitaxial films formed (e.g., grown) on the first group III-V layer 104. For example, the device 100 may include a second group III-V semiconductor compound layer 106 (referred to herein as second group III-V layer 106) formed on the first group III-V layer 104. In this example, the second group III-V layer 106 may include a III-V semiconductor compound including an epitaxial film including, but not limited to, indium gallium arsenide (InGaAs) and / or another epitaxial film. In one embodiment, the second group III-V layer 106 may include a protective layer.

[0023] In another example, device 100 can include a third group III-V semiconductor compound layer 108 (referred to herein as third group III-V layer 108) formed on second group III-V layer 106. In this example, third group III-V layer 108 can include a group III-V semiconductor compound including, but not limited to, an epitaxial film including indium arsenide (InAs) and / or another epitaxial film.

[0024] In another example, device 100 can include a fourth group III-V semiconductor compound layer 110 (referred to herein as fourth group III-V layer 110) formed on third group III-V layer 108. In this example, fourth group III-V layer 110 can include a group III-V semiconductor compound including, but not limited to, an epitaxial film including indium gallium arsenide (InGaAs) and / or another epitaxial film. In one embodiment, fourth group III-V layer 110 can include a protective layer.

[0025] The second group III-V layer 106, the third group III-V layer 108, and / or the fourth group III-V layer 110, as defined above, which may consist of epitaxial films, may be grown on the first group III-V layer 104 using an epitaxial film growth process (e.g., epitaxial deposition) performed in an epitaxial growth furnace. For example, the second group III-V layer 106, the third group III-V layer 108, and / or the fourth group III-V layer 110, and / or the combination thereof may be grown in situ together on the first group III-V layer 104 during the same fabrication stage (e.g., in situ epitaxial film growth performed in an epitaxial growth furnace). Utilizing such an in situ epitaxial film growth process to grow the second group III-V layer 106, the third group III-V layer 108, and / or the fourth group III-V layer 110 on the first group III-V layer 104 in such a manner can enable desirable crystallinity of each layer (film), as well as prevent oxidation and / or defects at the interface between each of such layers (e.g., at the interface between the second group III-V layer 106, the third group III-V layer 108, and / or the fourth group III-V layer 110, and / or a combination thereof), or at the interface between the first group III-V layer 104 and the second group III-V layer 106.

[0026] The second group III-V layer 106, the third group III-V layer 108, or the fourth group III-V layer 110, or a combination thereof, as defined above, may be formed into one or more semiconductor nanorods including one or more quantum wells of a Majorana Fermion device, where the third group III-V layer 108 may comprise an active layer, as described below. For example, the second group III-V layer 106, the third group III-V layer 108, or the fourth group III-V layer 110, or a combination thereof, may be formed into one or more ion-implanted defined nanorods of a suspended Majorana Fermion device in a semiconductor device, where the third group III-V layer 108 may comprise an active layer. For example, the second group III-V layer 106, the third group III-V layer 108, or the fourth group III-V layer 110, or a combination thereof, can be formed into one or more ion-implanted defining nanorods 406 of a Majorana-fermion device 2206, as described below and shown in Figures 22A and 22B, where the third group III-V layer 108 can include an active layer.

[0027] The first group III-V layer 104, i.e., an epitaxial semiconductor, may be epitaxially grown on the substrate layer 102. The material of the first group III-V layer 104 may be selected based on the composition of the substrate layer 102 and the second group III-V layer 106. In one embodiment, the first group III-V layer 104 is formed from indium aluminum arsenide (InAlAs) to match the crystal lattice of the adjacent second group III-V layer 106. In one embodiment, the first group III-V layer 104 has a compositional gradation from the substrate layer 102 to the second group III-V layer 106 to avoid creating crystal defects (e.g., dislocations) in the second group III-V layer 106. In one embodiment, the compositional gradation is a linear change. For example, if the substrate layer 102 includes gallium arsenide (GaAs) and the second group III-V layer 106 includes indium arsenide (InAs), it is difficult to grow a sufficiently high quality layer of InAs directly on the GaAs of the substrate layer 102. Thus, the first group III-V layer 104 begins with the substrate layer 102 with GaAs, and the gallium is progressively replaced with indium to eventually match the InAs of the second group III-V layer 106. These examples of materials are not intended to be limiting. From this disclosure, one skilled in the art can conceive of many other materials suitable for forming the first group III-V layer 104, which are contemplated within the scope of the exemplary embodiments.

[0028] The second group III-V layer 106, i.e., an epitaxial semiconductor, may be epitaxially grown on the first group III-V layer 104. The materials of the second group III-V layer 106 and the fourth group III-V layer 110 are selected based on the composition of the third group III-V layer 108 to provide a crystal quality above a certain quality threshold. In one embodiment, indium gallium arsenide (InGaAs) using a 0.8 In:1 Ga:0.2 As ratio is used for the second group III-V layer 106 and the fourth group III-V layer 110, with a 1:1 ratio of InAs for the third group III-V layer 108. In one embodiment, indium gallium arsenide (InGaAs) using a 0.53 In:1 Ga:0.47 As ratio, or 0.52 In:1 Ga:0.48 As ratio, is used for the second group III-V layer 106 and the fourth group III-V layer 110, with indium gallium arsenide (InGaAs) using a 0.7 In:1 Ga:0.3 As ratio for the third group III-V layer 108. In one embodiment, indium antimony (InSb) is used for the third group III-V layer 108, with In0.80-0.90Al0.1-0.2Sb (aluminum indium antimony (InAlSb) using a 1 In:0.8-0.9Al:0.1-0.2Sb ratio) being used for the second group III-V layer 106 and the fourth group III-V layer 110. In one embodiment, using indium phosphide (InP) as the substrate, the second group III-V layer 106 is lattice matched to the InP of the substrate layer 102. However, the second group III-V layer 106 and the fourth group III-V layer 110 can be formed using the same or different materials. Additionally, in some embodiments, the fourth group III-V layer 110 is not formed. These examples of materials are not intended to be limiting. From this disclosure, one skilled in the art can conceive of many other materials suitable for forming the second group III-V layer 106 and the fourth group III-V layer 110, which are contemplated within the scope of the exemplary embodiments. In one embodiment, the second group III-V layer 106 is about 4 nm thick, although thicker or thinner layers are also possible and contemplated within the scope of the exemplary embodiments.

[0029] The third group III-V layer 108 can be epitaxially grown on the second group III-V layer 106. In an embodiment, the third group III-V layer 108 is formed from indium arsenide (InAs) using a 1:1 In:As ratio, indium gallium arsenide (InGaAs) using a 0.7 In:1 Ga:0.3 As ratio, or indium antimony (InSb). These examples of substrate materials are not intended to be limiting. From this disclosure, one of ordinary skill in the art can conceive of many other materials suitable for forming the substrate layer 102, which are contemplated within the scope of the exemplary embodiments. In one embodiment, the third group III-V layer 108 is about 7 nm thick, although thicker or thinner layers are also possible and are contemplated within the scope of the exemplary embodiments.

[0030] The fourth group III-V layer 110, i.e., an epitaxial semiconductor, may be epitaxially grown on the third group III-V layer 108. In one embodiment, the fourth group III-V layer 110 is about 5 nm thick, although thicker or thinner layers are also possible and contemplated within the scope of the exemplary embodiment. The second group III-V layer 106 and the fourth group III-V layer 110 protect the surface of the third group III-V layer 108 from damage during fabrication. Damaged portions of the third group III-V layer 108 may degrade device characteristics. Thus, if the risk of damage during fabrication is sufficiently low, the fourth group III-V layer 110 may not be formed on the third group III-V layer 108. Additionally, the second group III-V layer 106 and the fourth group III-V layer 110 may be the same material or may be different materials.

[0031] 2 is a cross-sectional side view of the example non-limiting device 100 of FIG 1 after forming a superconducting layer to form a Majorana fermion device according to one or more embodiments described herein. Repeated descriptions of similar elements and / or similar processes utilized in other embodiments described herein are omitted for brevity.

[0032] Device 200 can include example non-limiting alternative embodiments of device 100 after forming superconducting layer 202. Superconducting layer 202 can include one or more superconducting materials, including but not limited to aluminum (Al) and / or another superconducting material. In one embodiment, superconducting layer 202 can include a thickness (e.g., height) ranging from about 5 nm to about 50 nm.

[0033] The superconducting layer 202 may be formed (e.g., grown) on the fourth group III-V layer 110 using an epitaxial film growth process (e.g., epitaxial deposition) performed in an epitaxial growth furnace. In one embodiment, the superconducting layer 202 may be grown on the fourth group III-V layer 110 using the same epitaxial film growth process performed in the same epitaxial growth furnace that may be used to grow the second group III-V layer 106, the third group III-V layer 108, the fourth group III-V layer 110, or a combination thereof, as described above. For example, the second group III-V layer 106, the third group III-V layer 108, the fourth group III-V layer 110, or the superconducting layer 202, or a combination thereof, may be grown in situ together during the same fabrication stage (e.g., in situ epitaxial film growth performed in an epitaxial growth furnace). Utilizing such an in situ epitaxial film growth process to grow the second group III-V layer 106, the third group III-V layer 108, the fourth group III-V layer 110, or the superconducting layer 202, or a combination thereof in such a manner can enable desirable crystallinity of each layer, as well as prevent oxidation and / or defects at the interface between each of such layers (e.g., at the interface between the second group III-V layer 106, the third group III-V layer 108, or the fourth group III-V layer 110, or a combination thereof), or at the interface between the fourth group III-V layer 110 and the superconducting layer 202.

[0034] As described above, the second group III-V layer 106, the third group III-V layer 108, and / or the fourth group III-V layer 110 can be formed into one or more semiconductor nanorods of a Majorana fermion device (e.g., one or more ion-implanted defined nanorods 406 of a Majorana fermion device 2206, as described below and shown in Figures 22A and 22B). By forming a superconducting layer 202 on the fourth group III-V layer 110 as described above, a superconducting material can be formed on such one or more semiconductor nanorods, which can enable observation of the behavior and / or properties of one or more Majorana fermions at the interface of the superconducting layer 202 and the fourth group III-V layer 110.

[0035] Figure 3A illustrates a top view of a first side of the exemplary, non-limiting device 200 of Figure 2 after forming a resist layer according to one or more embodiments described herein. In one example, the first side of device 200 may include the first side of device 300 illustrated in Figure 3A, which may include a top surface of device 300. Figure 3B illustrates a cross-sectional side view of device 300 as viewed along a plane defined by line 302. Repeated descriptions of similar elements and / or similar processes utilized in other embodiments described herein are omitted for brevity.

[0036] Device 300 may include an example non-limiting alternative embodiment of device 200 after forming a first resist layer 304. First resist layer 304 may include a photoresist material that may be formed on superconducting layer 202 using one or more of the photolithography, patterning, or photoresist techniques defined above, or a combination thereof (e.g., a lithographic patterning process). First resist layer 304 may include a photoresist, including but not limited to a positive tone photoresist, a negative tone photoresist, a hybrid tone photoresist, or another photoresist, or a combination thereof.

[0037] The first resist layer 304 may include a patterned resist that can be used to define regions of the device 300 that can be developed into a Majorana fermion device and / or one or more components thereof. For example, the first resist layer 304 may include a patterned resist that can be used as an ion implantation mask to define regions for superconductor regions and / or quantum well regions for Majorana nanowires (e.g., nanorods) and / or quantum dots, as well as semiconductor links between the quantum dots (e.g., as described below).

[0038] In one example, the first resist layer 304 can be used as an ion implantation mask to define the region 306 shown in FIG. 3A including a "U" shaped region of the device 300 that can be developed into a Majorana Fermion device including one or more ion implantation defined nanorods and / or one or more ion implantation defined sensing regions. In this example, the "U" shaped region 306 can include one or more subregions 308 that can be formed to extend along (e.g., parallel to) a plane defined by the lines 302 as shown in FIG. 3A, and such subregions 308 can be developed into one or more ion implantation defined nanorods of the Majorana Fermion device (e.g., one or more ion implantation defined nanorods 406 of the Majorana Fermion device 2206). In these examples, the "U" shaped region 306 may further include subregions 310, which may be formed to extend perpendicular to the plane defined by the lines 302, as shown in FIG. 3A, and such subregions 310 may be developed into one or more ion-implanted defined sensing regions including one or more quantum dots of the Majorana Fermion device (e.g., one or more ion-implanted defined sensing regions 408 of the Majorana Fermion device 2206).

[0039] While region 306 is shown in FIG. 3A with a “U” shaped configuration, it should be understood that various embodiments of the disclosure described herein are not so limited. For example, region 306 can include a variety of different configurations (e.g., “E”, “F”, “H”, “K”, “L”, “T”, etc.) that can be used to define a Majorana Fermion device as described above and / or one or more components thereof according to one or more embodiments described herein. Additionally or alternatively, the “U” shaped configuration of region 306 can result in two such ion implanted defined nanorods and one such ion implanted defined sensing area as described above, it should be understood that various embodiments of the disclosure described herein are not so limited. For example, the use of different configurations to form region 306 can result in various quantities of such ion implanted defined nanorods and / or such ion implanted defined sensing areas as described above, respectively.

[0040] 4A illustrates a top view of a first side of the exemplary non-limiting device 300 of FIGS. 3A and 3B after performing an ion implantation process to form ion implantation defined nanorods and ion implantation defined sensing regions according to one or more embodiments described herein. In one example, the first side of the device 300 may include the first side of the device 400 illustrated in FIG. 4A, which may include a top surface of the device 400. FIG. 4B illustrates a cross-sectional side view of the device 400 as viewed along a plane defined by line 402. Repeated descriptions of similar elements and / or similar processes utilized in other embodiments described herein are omitted for brevity.

[0041] 4A and 4B to form ion implantation regions 404, thereby facilitating definition of one or more circuit regions of device 400. For example, an ion implantation process may be performed to implant a low dose ion implant into second group III-V layer 106, third group III-V layer 108, or fourth group III-V layer 110, or a combination thereof, to thereby define a circuit region of a Majorana fermion device (e.g., Majorana fermion device 2206). For example, an ion implantation process may be performed to implant a low dose ion implant, including but not limited to helium (He), hydrogen (H2), oxygen (O2), argon (Ar), gallium (Ga), or another ion implant, or a combination thereof, into the second group III-V layer 106, the third group III-V layer 108, or the fourth group III-V layer 110, or a combination thereof, to thereby define one or more ion-implanted defined nanorods, or one or more ion-implanted defined sensing regions including one or more quantum dots as described above, or both.

[0042] The ion implantation process described above can be used to define such circuit regions of a Majorana fermion device (e.g., Majorana fermion device 2206) because ion implantation renders III-V semiconductor compound materials non-conductive (e.g., by destroying their crystal structure), thereby effectively rendering such materials insulators. Based on performing such an ion implantation process as described above using a "U" shaped first resist layer 304 to define region 306, ion implantation defined nanorods 406, shown in dashed lines in FIG. 4B, can be defined in subregion 308, shown in FIG. 4A. Additionally or alternatively, based on performing such an ion implantation process using a "U" shaped first resist layer 304 to define region 306, ion implantation defined sensing region 408, shown in dashed lines in FIG. 4B, can be defined in subregion 310, shown in FIG. 4A, such ion implantation defined sensing region 408 can include one or more quantum dots.

[0043] For example, ion implantation defined nanorods 406 can include portions of second group III-V layer 106, third group III-V layer 108, or fourth group III-V layer 110, or combinations thereof, such portions being indicated by dashed lines in FIG. 4B and within subregion 308. In this example, such regions of second group III-V layer 106, third group III-V layer 108, or fourth group III-V layer 110, or combinations thereof, will remain conductive after ion implantation into all other regions of device 400, and therefore such regions may be defined as circuit regions of the Majorana fermion device. In another example, the ion implantation defined sensing region 408 can include a portion of the second group III-V layer 106, the third group III-V layer 108, or the fourth group III-V layer 110, or a combination thereof, such portion being shown in dashed lines in FIG. 4B and within subregion 310. In this example, such regions of the second group III-V layer 106, the third group III-V layer 108, or the fourth group III-V layer 110, or a combination thereof, will remain conductive after ion implanting all other regions of device 400 and therefore such regions may be defined as circuit regions of the Majorana Fermion device. In the example provided above, the ion implantation defined nanorods 406 or the ion implantation defined sensing region 408, or a combination thereof, can be defined as a circuit region of a Majorana fermion device because performing such an ion implantation process can cause the second group III-V layer 106, the third group III-V layer 108, or the fourth group III-V layer 110, or a combination thereof, to lose electrical conductivity (e.g., by destroying their crystal structure) in all areas implanted as shown by the ion implantation region 404 in Figures 4A and 4B, and therefore, after the ion implantation is performed, the ion implantation region 404 has a dielectric nature.

[0044] Performing such an ion implantation process as described above can effectively result in an ion implanted region 404 coupled to the superconducting layer 202, ion implanted defining nanorods 406, and / or ion implanted defining sensing region 408, which may comprise components of a Majorana Fermion device. Such formation of an ion implanted region 404 coupled to the superconducting layer 202, ion implanted defining nanorods 406, and / or ion implanted defining sensing region 408 can allow for the suspension of a Majorana Fermion device in a quantum computing device. For example, with reference to Figures 22A and 22B, such formation of an ion implanted region 404 coupled to the superconducting layer 202, ion implanted defining nanorods 406, and / or ion implanted defining sensing region 408 can allow for the suspension of a Majorana Fermion device 2206 of device 2200 after removing a portion of encapsulation membrane 1404 as described below.

[0045] Utilizing such an ion implantation process can prevent damage to the material of device 400 that may be caused by using other techniques, such as reactive ion etching (RIE) and / or cleaning processes, to define such circuit regions. For example, such an ion implantation process can prevent damage to the regions of second group III-V layer 106, third group III-V layer 108, or fourth group III-V layer 110, or combinations thereof, that include ion implantation-defined nanorods 406 and / or ion implantation-defined sensing regions 408. In this example, such an ion implantation process can also prevent damage to superconducting layer 202.

[0046] In one embodiment, the subregions 308 and / or the ion implantation defined nanorods 406 can each include a length ranging from about 20 nm to about 1000 nm, or a width ranging from about 5 nm to about 200 nm, or both. In another embodiment, the subregions 310 and / or the ion implantation defined sensing regions 408 can each include a length ranging from about 20 nm to about 1000 nm, or a width ranging from about 5 nm to about 200 nm, or both.

[0047] 5A illustrates a top view of a first side of the exemplary non-limiting device 400 of FIGS. 4A and 4B after performing a wet etching process to remove a portion of the superconducting layer according to one or more embodiments described herein. In one example, the first side of the device 400 may include the first side of the device 500 illustrated in FIG. 5A, which may include a top surface of the device 500. FIG. 5B illustrates a cross-sectional side view of the device 500 as viewed along a plane defined by line 502. Repeated descriptions of similar elements and / or similar processes utilized in other embodiments described herein are omitted for the sake of brevity.

[0048] 5A and 5B, the device 500 may include an example non-limiting alternative embodiment of the device 400 after performing a wet etching process on the superconducting layer 202 to remove all portions of the superconducting layer 202 except for those portions that remain under the first resist layer 304. For example, a wet etching process using tetramethylammonium hydroxide (TMAH) may be performed to remove those sections of the superconducting layer 202, thereby facilitating alignment of the superconducting layer 202 over the ion implantation defined nanorods 406 or the ion implantation defined sensing regions 408, or a combination thereof.

[0049] 6A illustrates a top view of a first side of the exemplary non-limiting device 500 of FIGS. 5A and 5B after forming a second resist layer on and / or around the first resist layer according to one or more embodiments described herein. In one example, the first side of the device 500 may include the first side of the device 600 illustrated in FIG. 6A, which may include a top surface of the device 600. FIG. 6B illustrates a cross-sectional side view of the device 600 as viewed along a plane defined by line 602. Repeated descriptions of similar elements and / or similar processes utilized in other embodiments described herein are omitted for brevity.

[0050] The device 600 may include an example non-limiting alternative embodiment of the device 500 after forming a second resist layer 604 on or around the first resist layer 304, or a combination thereof, as shown in Figures 6A and 6B. The second resist layer 604 may include one or more of the photoresist materials defined above, which may be formed on or around the first resist layer 304, or a combination thereof, as shown in Figures 6A and 6B, using one or more photolithography, patterning, or photoresist techniques defined above, or a combination thereof (e.g., a lithographic patterning process).

[0051] The second resist layer 604 may comprise a pattern resist that can be used to pattern an opening 606 shown in Figure 6A that defines a portion of the superconducting layer 202 that will be removed to allow for the formation of one or more control gates that perpendicularly intersect the ion implantation defining nanorods 406. In some embodiments (not shown), such as those utilizing a bonding approach, the second resist layer 604 is not applied.

[0052] The openings 606 defined by the second resist layer 604 can enable removal of portions of the superconducting layer 202 from each side (e.g., surface) of the ion implantation-defined nanorods 406, thereby exposing such side of each of the ion implantation-defined nanorods 406, but leaving all other portions of the superconducting layer 202 intact (e.g., retaining portions of the superconducting layer 202 that are coupled (e.g., communicatively, electrically, operatively, optically, physically, etc.) to the ion implantation-defined nanorods 406). The openings 606 defined by the second resist layer 604 may enable such removal of portions of the superconducting layer 202 described above and shown in FIG. 6A such that a voltage may be applied to the ion implantation-defining nanorods 406 that will not be blocked by the superconducting layer 202 (e.g., an electric field will not be shielded by the superconducting layer 202) to enable the formation of one or more control gates (e.g., wires 1206a, 1206b described below and shown in FIGS. 22A and 22B) that vertically traverse the ion implantation-defining nanorods 406. A voltage may then be applied to the ion implantation-defining nanorods 406 to adjust the potential of the ion implantation-defining nanorods 406.

[0053] 7A illustrates a top view of a first side of the exemplary non-limiting device 600 of FIGS. 6A and 6B after performing a wet etching process to remove portions of the superconducting layer from the ion implantation defined nanorods and after stripping the first and second resist layers according to one or more embodiments described herein. In one example, the first side of the device 600 may include the first side of the device 700 illustrated in FIG. 7A, which may include the top surface of the device 700. FIG. 7B illustrates a cross-sectional side view of the device 700 as viewed along a plane defined by line 702. Repeated descriptions of similar elements and / or similar processes utilized in other embodiments described herein are omitted for brevity.

[0054] Device 700 can include an example, non-limiting alternative embodiment of device 600 after performing a wet etching process as described above to remove portions of superconducting layer 202 from ion implantation defining nanorods 406, and after stripping first resist layer 304 and second resist layer 604.

[0055] In one example, a wet etching process using tetramethylammonium hydroxide (TMAH) can be performed to remove such portions of the superconducting layer 202 from the ion implantation defining nanorods 406, thereby exposing a surface of each of the ion implantation defining nanorods 406 to which one or more control gates described above (e.g., wires 1206a, 1206b, described below and shown in Figures 22A and 22B) can be coupled. For example, a wet etching process using TMAH can be performed to remove such portions of the superconducting layer 202 from the ion implantation defining nanorods 406, thereby exposing a surface of the fourth group III-V layer 110 of each of the ion implantation defining nanorods 406, as shown in Figure 7A, to which one or more control gates described above can be coupled. Upon performing such a wet etching process, the first resist layer 304 and the second resist layer 604 can be stripped (e.g., removed and / or washed away) using an organic solvent.

[0056] 8A illustrates a top view of a first side of the exemplary non-limiting device 700 of FIGS. 7A and 7B after forming a first resist layer according to one or more embodiments described herein. In one example, the first side of device 700 may include the first side of device 800 illustrated in FIG. 8A, which may include a top surface of device 800. FIG. 8B illustrates a cross-sectional side view of device 800 as viewed along a plane defined by line 802. Repeated descriptions of similar elements and / or similar processes utilized in other embodiments described herein are omitted for brevity.

[0057] The device 800 may include an example non-limiting alternative embodiment of the device 700 after forming a resist layer, which may include the first resist layer 304, on a portion of the device 700 as shown in Figures 8A and 8B. The first resist layer 304 may include one or more of the photoresist materials defined above and may be formed using one or more of the photolithography, patterning, or photoresist techniques defined above, or combinations thereof (e.g., lithographic patterning processes). The first resist layer 304 may include a patterned resist that may be used to pattern an opening 804 shown in Figure 8A that defines a portion of the superconducting layer 202 to be removed from the fourth group III-V layer 110, thereby exposing a surface (e.g., a top surface) of the ion implantation defined sensing region 408 to allow further development of the ion implantation defined sensing region 408.

[0058] 9A illustrates a top view of a first side of the example, non-limiting device 800 of FIGS. 8A and 8B after performing a wet etching process to remove a portion of the superconducting layer from the semiconductor layer, according to one or more embodiments described herein. In one example, the first side of the device 800 may include the first side of the device 900 illustrated in FIG. 9A, which may include a top surface of the device 900. FIG. 9B illustrates a cross-sectional side view of the device 900 as viewed along a plane defined by line 902. Repeated descriptions of similar elements and / or similar processes utilized in other embodiments described herein are omitted for brevity.

[0059] The device 900 may include an example non-limiting alternative embodiment of the device 800 after a wet etch process is performed to remove a portion of the superconducting layer 202 from the fourth group III-V layer 110, as illustrated by the openings 804 and 904 shown in Figures 8A, 8B, 9A, and 9B. Removing such a portion of the superconducting layer 202 from the fourth group III-V layer 110 may enable further development of the ion implantation defined sensing region 408, as described below. In one example, a wet etch process using TMAH may be performed to remove such a portion of the superconducting layer 202 from the fourth group III-V layer 110.

[0060] FIG 10A illustrates a top view of a first side of the exemplary non-limiting device 900 of FIG 9A and FIG 9B after stripping the resist layer according to one or more embodiments described herein. In one example, the first side of the device 900 may include the first side of the device 1000 illustrated in FIG 10A, which may include the top surface of the device 1000. FIG 10B illustrates a cross-sectional side view of the device 1000 as viewed along a plane defined by line 1002. Repeated descriptions of similar elements and / or similar processes utilized in other embodiments described herein are omitted for brevity.

[0061] The device 1000 can include an example non-limiting alternative embodiment of the device 900 after stripping the first resist layer 304. In one example, the first resist layer 304 can be stripped (e.g., removed and / or washed off) using an organic solvent.

[0062] 11A shows a top view of a first side of the exemplary non-limiting device 1000 of FIG. 10A and FIG. 10B after forming a resist layer according to one or more embodiments described herein. In one example, the first side of the device 1000 may include the first side of the device 1100 shown in FIG. 11A, which may include a top surface of the device 1100. FIG. 11B shows a cross-sectional side view of the device 1100 as viewed along a plane defined by line 1102. Repeated descriptions of similar elements and / or similar processes utilized in other embodiments described herein are omitted for brevity.

[0063] The device 1100 may include an example non-limiting alternative embodiment of the device 1000 after forming a resist layer, which may include a first resist layer 304 on a portion of the device 1000, as shown in Figures 11A and 11B. The first resist layer 304 may include one or more of the photoresist materials defined above that may be formed using one or more of the photolithography, patterning, or photoresist techniques defined above, or combinations thereof (e.g., lithographic patterning processes). The first resist layer 304 may include a pattern resist that may be used to pattern one or more openings 1104, as shown in Figures 11A and 11B, for example, that define areas of the device 1100 to which one or more contact gates (e.g., electrical contacts) may be coupled (e.g., communicatively, electrically, operatively, optically, physically, etc.). For example, the first resist layer 304 may include a pattern resist that may be used to pattern, for example, one or more openings 1104 as shown in Figures 11A and 11B that define areas on one or more surfaces (e.g., top surfaces) of the ion implantation-defined nanorods 406 and / or the ion implantation-defined sensing region 408 to which one or more contact gates may be coupled. In one example, the first resist layer 304 may include a lift-off structure having an undercut profile, and metal may be evaporated onto such lift-off structure to enable the formation of one or more contact gates as described above.

[0064] 12A illustrates a top view of a first side of the exemplary non-limiting device 1100 of FIG. 11A and FIG. 11B after depositing a metal layer to form one or more wires according to one or more embodiments described herein. In one example, the first side of the device 1100 may include the first side of the device 1200 illustrated in FIG. 12A, which may include a top surface of the device 1200. FIG. 12B illustrates a cross-sectional side view of the device 1200 as viewed along a plane defined by line 1202. Repeated descriptions of similar elements and / or similar processes utilized in other embodiments described herein are omitted for brevity.

[0065] Device 1200 may include example, non-limiting alternative embodiments of device 1100 after a surface (e.g., an upper surface) of fourth group III-V layer 110 and superconducting layer 202 has been cleaned, a metal layer 1204 has been deposited on device 1100, or device 1100 has been washed with a solvent, or a combination thereof, thereby forming one or more wires 1206 coupled to one or more surfaces of device 1100. For example, device 1200 can include example non-limiting alternative embodiments of device 1100 after cleaning the top surfaces of fourth group III-V layer 110 and superconducting layer 202, depositing a metal layer 1204 on the top surface of fourth group III-V layer 110 (e.g., on top surfaces of ion implantation defining nanorods 406 and / or ion implantation defining sensing region 408) using a metal deposition process, or rinsing device 1100 with an organic solvent to form one or more wires 1206 coupled to the top surface of fourth group III-V layer 110 (e.g., on top surfaces of ion implantation defining nanorods 406 and / or ion implantation defining sensing region 408), or combinations thereof. Metal layer 1204 can be formed such that wire 1206 can include a thickness (e.g., height) ranging from about 5 nm to about 100 nm and / or a width ranging from about 5 nm to about 50 nm. As described below with reference to Figures 22A, 22B, and 24, the wires 1206 can include wires 1206a, 1206b that can be coupled to one or more conductive components of the Majorana fermion device 2206 and a support region 2402 of the device 2400, where the device 2400 can constitute a quantum computing device.

[0066] The metal layer 1204 and / or the one or more wires 1206 may include a conductive component through which an electrical current (e.g., AC or DC, or both), an electrical signal (e.g., microwave frequency signal, etc.), or an optical signal, or a combination thereof, can flow. The metal layer 1204 and / or the one or more wires 1206 may be deposited (e.g., via a metal deposition process) on the first resist layer 304, the fourth III-V layer 110, and / or the superconducting layer 202 of the device 1100 using one or more materials including, but not limited to, aluminum (Al), copper, copper alloys (e.g., copper-nickel), gold, platinum, palladium, gold alloys (e.g., gold-palladium), brass, or any other conductive metal or alloy, or a combination thereof. In one example, the one or more wires 1206 can include one or more conductive components including, but not limited to, a control wire, a tunnel junction gate, a pinch gate, a chemical potential control gate, a sensing wire, a semiconductor connector, an electrode, a circuit wire, a contact, or another conductive component, or a combination thereof.

[0067] 13A illustrates a top view of a first side of the exemplary non-limiting device 1200 of FIG. 12A and FIG. 12B after removing the resist layer and / or metal layer according to one or more embodiments described herein. In one example, the first side of the device 1200 may include the first side of the device 1300 illustrated in FIG. 13A, which may include the top surface of the device 1300. FIG. 13B illustrates a cross-sectional side view of the device 1300 as viewed along a plane defined by line 1302. Repeated descriptions of similar elements and / or similar processes utilized in other embodiments described herein are omitted for brevity.

[0068] The device 1300 can include an example non-limiting alternative embodiment of the device 1200 after cleaning the device 1200 with a solvent to remove the first resist layer 304 and / or the metal layer 1204. For example, the device 1300 can include an example non-limiting alternative embodiment of the device 1200 after cleaning the device 1200 with an organic solvent to remove the first resist layer 304 (e.g., a lift-off structure previously formed using the first resist layer 304) and / or the metal layer 1204. Removal of such layers can result in the device 1300 including one or more wires 1206 bonded to an upper surface of the fourth group III-V layer 110 (e.g., bonded to an upper surface of the ion implantation-defined nanorods 406 and / or the ion implantation-defined sensing region 408), as shown in Figures 13A and 13B.

[0069] FIG 14A shows a top view of a first side of the exemplary non-limiting device 1300 of FIG 13A and FIG 13B after forming an encapsulation membrane according to one or more embodiments described herein. In one example, the first side of the device 1300 can include the first side of the device 1400 shown in FIG 14A, which can include the top surface of the device 1400. FIG 14B shows a cross-sectional side view of the device 1400 as viewed along a plane defined by line 1402. Repeated descriptions of similar elements and / or similar processes utilized in other embodiments described herein are omitted for brevity.

[0070] Device 1400 can include example non-limiting alternative embodiments of device 1300 after forming encapsulation film 1404. In one example, encapsulation film 1404 can be formed on device 1300 using one or more material deposition techniques defined above (e.g., evaporation techniques, sputtering techniques, chemical vapor deposition (CVD), atomic layer deposition (ALD), physical vapor deposition (PVD), molecular beam epitaxy (MBE), electrochemical deposition (ECD), etc.). In another example, encapsulation film 1404 can be formed on device 1300 using an assembly process (e.g., packaging process, sealing process, etc.) that enables packaging of integrated circuits such as semiconductor devices.

[0071] Forming the encapsulation membrane 1404 on the device 1300 may allow for coupling of the encapsulation membrane 1404 to one or more elements (e.g., layers, films, components, etc.) of the device 1300. For example, forming the encapsulation membrane 1404 on the device 1300 may allow for coupling of the encapsulation membrane 1404 to an ion-implanted region 404, which may be coupled to the superconducting layer 202, the ion-implanted defining nanorods 406, or the ion-implanted defining sensing region 408, or combinations thereof, which may constitute components of a Majorana Fermion device as described above. In this example, such formation of the encapsulation membrane 1404 coupled to the ion-implanted region 404 may allow for suspending a Majorana Fermion device of a quantum computing device. For example, with reference to Figures 22A and 22B, so forming an encapsulation membrane 1404 coupled to an ion implantation region 404 may allow for the Majorana fermion device 2206 of device 2200 to be suspended after removing a portion of the encapsulation membrane 1404 as described below.

[0072] Forming the encapsulation membrane 1404 on the device 1300 may allow the device 1400 to be flipped over to access a second side of the device 1400. For example, forming the encapsulation membrane 1404 on the device 1300 may allow the device 1400 to be flipped over to access a bottom side of the device 1400, thereby allowing one or more additional contact gates (e.g., one or more wires 1206) to be formed on such bottom side of the device 1400, as described below.

[0073] The encapsulation film 1404 can include one or more materials, including, but not limited to, germanium (Ge), silicon germanium (SiGe), oxide, tungsten oxide, silicon dioxide (SiO2), gallium arsenide (GaAs), or another material, or a combination thereof. In one example (not shown), the encapsulation film 1404 can include a multi-layer encapsulation film. For example, the encapsulation film 1404 can include an atomic layer deposition (ALD) film and an amorphous layer. In another example, the encapsulation film 1404 can include one or more of the materials defined above and / or another material that can be formed on the device 1300 to enable the device 1400 to be so flipped as described above, or can be further removed using an aqueous solution, or both.

[0074] FIG 15A shows a top view of a first side of the exemplary non-limiting device 1400 of FIG 14A and FIG 14B after bonding a second substrate layer to an encapsulation membrane according to one or more embodiments described herein. In one example, the first side of the device 1400 can include the first side of the device 1500 shown in FIG 15A, which can include a top surface of the device 1500. FIG 15B shows a cross-sectional side view of the device 1500 as viewed along a plane defined by line 1502. Repeated descriptions of similar elements and / or similar processes utilized in other embodiments described herein are omitted for brevity.

[0075] Device 1500 can include example non-limiting alternative embodiments of device 1400 after planarizing encapsulation membrane 1404 and / or bonding second substrate layer 1504 to encapsulation membrane 1404. For example, device 1500 can include example non-limiting alternative embodiments of device 1400 after performing chemical mechanical planarization (CMP) to planarize encapsulation membrane 1404 and / or bonding second substrate layer 1504 to encapsulation membrane 1404 using a wafer bonding process (e.g., direct bonding, plasma activated bonding, anodic bonding, eutectic bonding, glass-frit bonding, adhesive bonding, thermocompression bonding, transient liquid phase diffusion bonding, surface activated bonding, etc.).

[0076] In one embodiment, the second substrate layer 1504 may include one or more of the same materials as the substrate layer 102 defined above (e.g., Si, Al2O3, SiGe, SiGeC, SiC, Ge alloys, III / V compound semiconductors, II / VI compound semiconductors, etc.) The second substrate layer 1504 may include a thickness ranging from about 200 μm to about 750 μm.

[0077] 16A shows a top view of a first side of the exemplary non-limiting device 1500 of FIG. 15A and FIG. 15B after removing a substrate layer according to one or more embodiments described herein. In one example, the first side of the device 1500 can include the first side of the device 1600 shown in FIG. 16A, which can include a top surface of the device 1600. FIG. 16B shows a cross-sectional side view of the device 1600 as viewed along a plane defined by line 1602. Repeated descriptions of similar elements and / or similar processes utilized in other embodiments described herein are omitted for brevity.

[0078] Device 1600 may include example, non-limiting alternative embodiments of device 1500 after removal of substrate layer 102. For example, device 1600 may include example, non-limiting alternative embodiments of device 1500 after separation of substrate layer 102 from first group III-V layer 104 using one or more material removal techniques (e.g., CMP, etching, backgrinding, etc.) defined above.

[0079] 17A illustrates a top view of a first side of the exemplary non-limiting device 1600 of FIG. 16A and FIG. 16B after removing the semiconductor layer according to one or more embodiments described herein. In one example, the first side of the device 1600 may include the first side of the device 1700 illustrated in FIG. 17A, which may include the top surface of the device 1700. FIG. 17B illustrates a cross-sectional side view of the device 1700 as viewed along a plane defined by line 1702. Repeated descriptions of similar elements and / or similar processes utilized in other embodiments described herein are omitted for brevity.

[0080] Device 1700 can include example, non-limiting alternative embodiments of device 1600 after removal of first group III-V layer 104. For example, device 1700 can include example, non-limiting alternative embodiments of device 1600 after removal of first group III-V layer 104 from second group III-V layer 106 using one or more material removal techniques (e.g., CMP, etching, backgrinding, etc.) defined above.

[0081] FIG 18A shows a top view of a second side of the exemplary non-limiting device 1700 of FIG 17A and FIG 17B after spinning and forming a resist layer according to one or more embodiments described herein. In one example, the second side of the device 1700 can include the second side of the device 1800 shown in FIG 18A, which can include a bottom side of the device 1800. FIG 18B shows a cross-sectional side view of the device 1800 as viewed along a plane defined by line 1802. Repeated descriptions of similar elements and / or similar processes utilized in other embodiments described herein are omitted for brevity.

[0082] Device 1800 may include an example, non-limiting alternative embodiment of device 1700 after flipping device 1700 (e.g., rotating device 1700 180 degrees about an axis perpendicular to the page) and forming a resist layer, which may include first resist layer 304, over a portion of device 1700, as shown in Figures 18A and 18B. First resist layer 304 may include one or more of the photoresist materials defined above and may be formed using one or more of the photolithography, patterning, or photoresist techniques, or combinations thereof (e.g., lithographic patterning processes) defined above. The first resist layer 304 may include a pattern resist that may be used to pattern one or more openings 1804 that define areas of the device 1800 to which one or more contact gates (e.g., electrical contacts) and / or an extended electrode layer may be coupled (e.g., communicatively, electrically, operatively, optically, physically, etc.), as shown in Figures 18A and 18B. For example, the first resist layer 304 may include a pattern resist that may be used to pattern one or more openings 1804 that define areas on one or more surfaces (e.g., bottom surfaces) of the ion implantation-defined nanorods 406 and / or the ion implantation-defined sensing region 408 to which one or more contact gates (e.g., electrical contacts) and / or an extended electrode layer may be coupled (e.g., communicatively, electrically, operatively, optically, physically, etc.), as shown in Figures 18A and 18B. In one example, the first resist layer 304 may include a lift-off structure having an undercut profile, and metal may be deposited on such lift-off structure to enable the formation of one or more contact gates as described above.

[0083] 19A illustrates a top view of a second side of the exemplary non-limiting device 1800 of FIGS. 18A and 18B after depositing a metal layer to form one or more wires according to one or more embodiments described herein. In one example, the second side of the device 1800 can include the second side of the device 1900 illustrated in FIG. 19A, which can include a bottom side of the device 1900. FIG. 19B illustrates a cross-sectional side view of the device 1900 as viewed along a plane defined by line 1902. Repeated descriptions of similar elements and / or similar processes utilized in other embodiments described herein are omitted for brevity.

[0084] Device 1900 may include example, non-limiting alternative embodiments of device 1800 after cleaning a surface (e.g., bottom surface) of second group III-V layer 106, depositing metal layer 1204 on device 1800, or rinsing device 1800 with a solvent, or combinations thereof, thereby forming one or more wires 1206 coupled to one or more surfaces of device 1800 (e.g., in addition to one or more wires 1206 formed on device 1200 as described above), or, in some embodiments, an extended electrode layer 1904 coupled to such one or more surfaces of device 1800 (e.g., formation of extended electrode layer 1904 on device 1900 may be optional), or both. Because formation of extended electrode layer 1904 on device 1900 may be optional, for clarity, it is not shown in FIG. 19B . In one example, device 1900 can include an example non-limiting alternative embodiment of device 1800 after cleaning a bottom surface of second group III-V layer 106, depositing metal layer 1204 on the bottom surface of second group III-V layer 106 (e.g., bottom surfaces of ion implantation defining nanorods 406 and / or ion implantation defining sensing area 408) using a metal deposition process, or washing device 1800 with an organic solvent, or a combination thereof, to form one or more wires 1206 and / or extended electrode layer 1904 coupled to the bottom surface of second group III-V layer 106 (e.g., bottom surfaces of ion implantation defining nanorods 406 and / or ion implantation defining sensing area 408).

[0085] As discussed above, the metal layer 1204 and / or the wire(s) 1206 can include conductive components through which an electrical current (e.g., AC or DC or both), an electrical signal (e.g., microwave frequency signal, etc.), or an optical signal, or a combination thereof, can flow. The metal layer 1204 and / or the wire(s) 1206 can be deposited (e.g., via a metal deposition process) on the first resist layer 304 and / or the second III-V layer 106 of the device 1100 using one or more materials including, but not limited to, aluminum (Al), copper, copper alloys (e.g., copper-nickel), gold, platinum, palladium, gold alloys (e.g., gold-palladium), brass, or any other conductive metal or alloy, or a combination thereof. In one example, the wire(s) 1206 can include one or more conductive components including, but not limited to, a control wire, a tunnel junction gate, a pinch gate, a chemical potential control gate, a sense wire, a semiconductor connector, an electrode, a circuit wire, a contact, or another conductive component, or a combination thereof. The metal layer 1204 can be formed such that the wires 1206 can include a thickness (e.g., height) ranging from about 5 nm to about 100 nm and / or a width ranging from about 5 nm to about 50 nm. In one embodiment, the metal layer 1204 can be formed such that the wires 1206 can include a thickness (e.g., height) ranging from 20 nm to 50 nm.

[0086] In embodiments in which the extended electrode layer 1904 is coupled to one or more surfaces (e.g., a bottom surface) of the second group III-V layer 106 (e.g., a bottom surface of the ion implantation-defined nanorods 406 and / or the ion implantation-defined sensing region 408), the extended electrode layer 1904 can include a quasiparticle gettering structure that can repel unwanted quasiparticles from one or more components of the device 1900 (e.g., the ion implantation-defined nanorods 406, the ion implantation-defined sensing region 408, the Majorana-Fermion device 2206, etc.). For example, the extended electrode layer 1904 can include a quasiparticle gettering structure that can enable application of a charge to the ion implantation-defined nanorods 406, such a charge can act as a barrier to repel quasiparticle electrons that may be in the vicinity of the ion implantation-defined nanorods 406 and / or the ion implantation-defined sensing region 408. The extended electrode layer 1904 may thereby enable reduced defects and / or improved lifetime of the ion implanted defined nanorods 406 and / or the ion implanted defined sensing region 408 by preventing quasiparticle electrons from transferring to the ion implanted defined nanorods 406 and / or the ion implanted defined sensing region 408 and quenching the Majorana fermions, thereby potentially destroying the coherence of the Majorana fermions. The extended electrode layer 1904 is shown in FIG. 19A for illustrative purposes only, as it is optional, and it should be understood that the present disclosure, according to one or more of the embodiments described herein, is not so limited.

[0087] In embodiments in which the extended electrode layer 1904 is bonded to one or more surfaces (e.g., a bottom surface) of the second group III-V layer 106 (e.g., a bottom surface of the ion implantation-defined nanorods 406 and / or the ion implantation-defined sensing area 408) as described above, the extended electrode layer 1904 can include the same type of conductive components and / or the same materials as used to form the metal layer 1204 and / or the wires 1206. In one example, the extended electrode layer 1904 can be formed simultaneously with the metal layer 1204 and / or the wires 1206 and / or using the same metal deposition process as used to form the metal layer 1204 and / or the wires 1206 as described above. In another example, extended electrode layer 1904 can be formed at a different time than metal layer 1204 and / or wires 1206, using a different metal deposition process than that used to form metal layer 1204 and / or wires 1206 as described above, and / or using different materials than those described above that can be used to form metal layer 1204 and / or wires 1206. In some embodiments, extended electrode layer 1904 can include a width ranging from about 300 nm to about 5000 nm, or a length ranging from about 300 nm to about 5000 nm, or both.

[0088] FIG. 20A shows a top view of the second side of the exemplary non-limiting device 1900 of FIG. 19A and FIG. 19B after removing the resist layer and the metal layer according to one or more embodiments described herein. In one example, the second side of the device 1900 can include the second side of the device 2000 shown in FIG. 20A, which can include the bottom side of the device 2000. FIG. 20B shows a cross-sectional side view of the device 2000 as viewed along a plane defined by line 2002. Repeated descriptions of similar elements and / or similar processes utilized in other embodiments described herein are omitted for brevity. The extended electrode layer 1904 is shown in FIG. 20A and FIG. 20B for illustrative purposes only, as it is optional, and it should be understood that the present disclosure according to one or more of the embodiments described herein is not so limited.

[0089] The device 2000 can include an example non-limiting alternative embodiment of the device 1900 after cleaning the device 1900 with a solvent to remove the first resist layer 304 and / or the metal layer 1204. For example, the device 2000 can include an example non-limiting alternative embodiment of the device 1900 after cleaning the device 1900 with an organic solvent to remove the first resist layer 304 (e.g., a lift-off structure previously formed using the first resist layer 304) and / or the metal layer 1204. Removal of such layers can result in the device 2000 including one or more wires 1206 and / or an extended electrode layer 1904 bonded to an upper surface of the fourth III-V layer 110 (e.g., bonded to an upper surface of the ion implantation defining nanorods 406 and / or the ion implantation defining sensing region 408).

[0090] In some embodiments, the one or more wires 1206 can include wires 1206a, 1206b that can be coupled to the second group III-V layer 106 or the fourth group III-V layer 110, or both, as shown in Figures 20A and 20B (e.g., can be coupled to the top or bottom surface or both of the ion implantation-defined nanorod 406 or the ion implantation-defined sensing region 408). The wires 1206a, 1206b can include a control wiring structure (e.g., an electrode). For example, the wire 1206a can include a chemical potential control electrode that can enable application of a voltage to the wire 1206a to change the energy of the ion implantation-defined nanorod 406 to a zero-energy state, thereby forming Majorana fermions (e.g., to facilitate observation of the properties, behavior, etc. of Majorana fermions). In another example, wire 1206b may include a pinch gate that allows such Majorana fermions to interact with a quantum structure (e.g., quantum well of device 2000 includes quantum dots, ion implantation defined sensing region 408, etc.). For example, varying a voltage on the pinch gate may allow current to flow through one or more components of device 2000 (e.g., second group III-V layer 106, third group III-V layer 108, fourth group III-V layer 110, superconducting layer 202, ion implantation defined nanorods 406, ion implantation defined sensing region 408, etc.), allowing sensing of the Majorana fermion structure (e.g., facilitating observation of Majorana fermion properties, behavior, etc.).

[0091] FIG. 21A illustrates a top view of a second side of the exemplary non-limiting device 2000 of FIGS. 20A and 20B after removing one or more portions of the ion-implanted region from the encapsulation membrane to form one or more openings, according to one or more embodiments described herein. In one example, the second side of the device 2000 can include the second side of the device 2100 illustrated in FIG. 21A, which can include a bottom side of the device 2100. FIG. 21B illustrates a cross-sectional side view of the device 2100 as viewed along a plane defined by line 2102. Repeated descriptions of similar elements and / or similar processes utilized in other embodiments described herein are omitted for brevity.

[0092] It should be understood that the extended electrode layer 1904 is shown in FIG. 21A merely for illustrative purposes, as it is optional, and the present disclosure according to one or more of the embodiments described herein is not so limited. For clarity, the extended electrode layer 1904 is not shown in FIG.

[0093] The device 2100 may include an example non-limiting alternative embodiment of the device 2000 after removing one or more portions of the ion implantation region 404 from the encapsulation membrane 1404 to form one or more openings 2104 as shown in FIGS. 21A and 21B. For example, the device 2100 may include an example non-limiting alternative embodiment of the device 2000 after forming a pattern resist (e.g., the first resist layer 304 using one or more lithography techniques described above) on a surface of the ion implantation region 404 and / or removing such one or more portions of the ion implantation region 404 from the encapsulation membrane 1404 (e.g., using one or more material removal techniques (e.g., CMP, etching, etc.) described above). In this example, the formation of such openings 2104 may expose a surface of the encapsulation membrane 1404 to enable removal of one or more portions of the encapsulation membrane 1404 as described below.

[0094] FIG. 22A is a top view of a second side of the exemplary non-limiting device 2100 of FIGS. 21A and 21B after removing one or more portions of the encapsulation membrane to form one or more hollow spaces and suspended Majorana fermion devices according to one or more embodiments described herein. In one example, the second side of the device 2100 can include the second side of the device 2200 shown in FIG. 22A, which can include a bottom side of the device 2200. FIG. 22B shows a cross-sectional side view of the device 2200 as viewed along a plane defined by line 2202. Repeated descriptions of similar elements and / or similar processes utilized in other embodiments described herein are omitted for brevity.

[0095] It should be understood that the extended electrode layer 1904 is shown in FIG. 22A merely for illustrative purposes, as it is optional, and the present disclosure according to one or more of the embodiments described herein is not so limited. For clarity, the extended electrode layer 1904 is not shown in FIG. 22B.

[0096] Device 2200 can include example non-limiting alternative embodiments of device 2100 after one or more portions of encapsulation membrane 1404 have been removed from device 2100 to form one or more hollow spaces 2204 shown in Figures 22A and 22B. For example, device 2200 can include example non-limiting alternative embodiments of device 2100 after such one or more portions of encapsulation membrane 1404 have been removed from device 2100 using, for example, a wet etching process (e.g., using a mild wet etching solution such as, for example, water, an organic solvent, etc.), a plasma process (e.g., mild plasma material removal), or another material removal technique, or a combination thereof.

[0097] 21A and 21B as being directly bonded to the superconducting layer 202, the ion implanted defining nanorods 406, and / or the ion implanted defining sensing region 408, and because the encapsulating membrane 1404 may include amorphous and / or dielectric films, as described above, the encapsulating membrane 1404 may have defects that may cause quenching of Majorana fermions that may occur in the device 2100. Hence, removal of the encapsulating membrane 1404 may prevent such direct bonding, and thereby prevent quenching of Majorana fermions that may occur in the device 2100.

[0098] In one embodiment, the device 2200 may include a quantum computing device (e.g., quantum circuit, quantum hardware, quantum processor, quantum computer, etc.) including a Majorana fermion device 2206, as shown in FIG. 22A and FIG. 22B by the thick dashed line. In that regard, one or more sides of the Majorana fermion device 2206 may be exposed to the hollow space 2204 of the device 2200 by removing such portion of the encapsulation membrane 1404 to form the hollow space 2204, as described above. For example, the Majorana fermion device 2206 may include a portion of the second group III-V layer 106, the third group III-V layer 108, the fourth group III-V layer 110, the superconducting layer 202, the ion implantation defined nanorod 406, or the ion implantation defined sensing region 408, or a combination thereof, as shown in FIG. 22A and FIG. 22B by the thick dashed line. In this example, one or more surfaces of one or more of such elements can include one or more side surfaces of Majorana fermion device 2206 that can be exposed to hollow space 2204. For example, as shown in FIG. 22B, one or more surfaces of fourth III-V layer 110, superconducting layer 202, ion implantation defining nanorods 406, or ion implantation defining sensing region 408 of Majorana fermion device 2206, or combinations thereof, can include such one or more side surfaces of Majorana fermion device 2206 that can be exposed to hollow space 2204.

[0099] In another example (not shown), one or more surfaces of the second group III-V layer 106, the ion implantation defining nanorods 406, and / or the ion implantation defining sensing region 408 of the Majorana fermion device 2206 may include one or more such sides of the Majorana fermion device 2206 that may be exposed to a hollow space 2204 that may be positioned above the second group III-V layer 106 (e.g., positioned “above” the second group III-V layer 106 with respect to the layout of elements shown in FIG. 22B). In one or more of the above examples, such formation of the hollow space 2204 above and / or below the Majorana fermion device 2206 may enable the Majorana fermion device 2206 of the device 2200 to be suspended (e.g., “above” and / or “below” with respect to the layout of elements shown in FIG. 22B). For example, a portion of the ion implantation region 404 may remain coupled to the Majorana fermion device 2206 after forming the opening 2104 as shown in Figures 21A, 21B, 22A, and 22B. Such remaining portion of the ion implantation region 404 may be further coupled to a portion of the encapsulation membrane 1404 remaining after forming the hollow space 2204 above and / or below the Majorana fermion device 2206 (e.g., "above" and / or "below" with respect to the layout of elements shown in Figure 22B) as shown in Figures 22A and 22B. Such remaining portions of the encapsulation membrane 1404 may also remain bonded to the second substrate layer 1504 after forming a hollow space 2204 above and / or below the Majorana fermion device 2206 (e.g., "above" and / or "below" with respect to the layout of elements shown in FIG. 22B) as shown in FIGS. 22A and 22B.Such remaining portions of ion implantation region 404 and / or encapsulation membrane 1404 remaining after forming opening 2104 and / or hollow space 2204, respectively, may provide physical (e.g., mechanical) support for Majorana fermion device 2206, enabling it to be suspended above and / or below hollow space 2204 of device 2200 as shown in Figures 22A and 22B (e.g., "above" and / or "below" with respect to the layout of elements shown in Figure 22B).

[0100] In another example, as shown in Figures 22A and 22B, one or more wires 1206a, 1206b can be coupled to one or more sides of the Majorana Fermion device 2206 described above that may be exposed to the hollow space 2204 of the device 2200. In this example, such wires 1206a, 1206b can be coupled to such sides of the Majorana Fermion device 2206 within the hollow space 2204 of the device 2200. As described below with reference to Figure 24, the wires 1206a, 1206b can be further coupled to one or more conductive components of a support region 2402 of a device 2400, where the device 2400 can constitute a quantum computing device.

[0101] As mentioned above, in some embodiments, the formation of the extended electrode layer 1904 may be optional. In one embodiment in which the extended electrode layer 1904 is formed in the device 2200, the extended electrode layer 1904 may be bonded to one or more surfaces (e.g., bottom surface) of the second group III-V layer 106 (e.g., bottom surface of the ion implantation defining nanorods 406) as shown in FIG. 22A. In another example (not shown) in which the extended electrode layer 1904 is formed in the device 2200, the extended electrode layer 1904 may be bonded to one or more surfaces (e.g., top surface) of the fourth group III-V layer 110 (e.g., top surface of the ion implantation defining nanorods 406 and / or the ion implantation defining sensing area 408), or to the superconducting layer 202, or both.

[0102] FIG. 23A is a top view of the second side of the exemplary non-limiting device 2100 of FIG. 21A and FIG. 21B after removing one or more portions of the encapsulation film and depositing one or more metal pads according to one or more embodiments described herein. In one example, the second side of the device 2100 can include the second side of the device 2300 shown in FIG. 23A, which can include the bottom side of the device 2300. FIG. 23B shows a cross-sectional side view of the device 2300 as viewed along a plane defined by line 2302. Repeated descriptions of similar elements and / or similar processes utilized in other embodiments described herein are omitted for brevity. The extended electrode layer 1904 is shown in FIG. 23A and FIG. 23B for illustrative purposes only, as it is optional, and it should be understood that the present disclosure according to one or more of the embodiments described herein is not so limited.

[0103] The device 2300 may include an example non-limiting alternative embodiment of the device 2100 after removing one or more portions of the encapsulation film 1404 from the device 2100 and / or depositing one or more metal pads 2304, which may include the metal layer 1204 and / or the metal wires 1206. For example, the device 2300 may include an example non-limiting alternative embodiment of the device 2100 after removing such one or more portions of the encapsulation film 1404 from the device 2100 using the opening 2104 (e.g., wet etching using water, organic solvents, etc.) and depositing the metal pads 2304 using one or more of the material deposition techniques described above. In one embodiment (not shown), the metal pads 2304 may be formed to be coupled to the wires 1206 (e.g., wires 1206a, 1206b). The metal pads 2304 may include one or more of the materials defined above that may be used to form the metal layer 1204 and / or the wires 1206.

[0104] 24 illustrates a top view of an example non-limiting device 2400 that can enable a suspended Majorana fermion device including ion implantation defined nanorods in a semiconductor device according to one or more embodiments described herein. Repeated descriptions of similar elements and / or similar processes utilized in other embodiments described herein are omitted for brevity.

[0105] Device 2400 may include an example non-limiting alternative embodiment of device 2200, where device 2400 may include a quantum computing device including multiple devices 2200 and / or one or more regions of support 2402. For example, device 2400 may include multiple devices 2200, where each such device may include a Majorana Fermion device 2206 that may be suspended in a hollow space 2204 of device 2200 as described above. In this example, each such device 2200 may further include wires 1206a, 1206b coupled to the Majorana Fermion device 2206 within the hollow space 2204 of device 2200.

[0106] The one or more support regions 2402 of the device 2400 can include one or more support elements and / or one or more wiring structures of the device 2400. For example, the support region 2402 can include portions of the ion implanted region 404 and / or the encapsulation membrane 1404 that remain after other portions of those components are removed to form the hollow space 2204, as described above. In another example, the support region 2402 can include one or more metallization layers having wire structures, e.g., conductive components, etc., that can be coupled to the wires 1206a, 1206b, the metal pads 2304, or another component of the device 2200, or a combination thereof, to facilitate performing one or more operations of the device 2200 according to one or more embodiments of the present disclosure described herein.

[0107] The device 2200 and / or the Majorana fermion device 2206 may be associated with various technologies, for example, the device 2200 and / or the Majorana fermion device 2206 may be associated with semiconductor device technology and / or superconductor device technology, semiconductor device fabrication technology and / or superconductor device fabrication technology, quantum computing device technology, quantum computing device fabrication technology, Majorana fermion device technology, Majorana fermion device fabrication technology, and / or other technologies.

[0108] The device 2200 and / or Majorana fermion device 2206 may provide technical improvements over the various techniques listed above. For example, the formation of the Majorana fermion device 2206 including ion-implanted defined nanorods 406, which may be defined using an ion implantation process, may prevent damage to the material of the device 2200 that may be caused by using other techniques (e.g., reactive ion etching (RIE) and / or cleaning processes) to define the circuit region of the Majorana fermion device. For example, such an ion implantation process may prevent damage to the regions of the second group III-V layer 106, the third group III-V layer 108, or the fourth group III-V layer 110, or combinations thereof, that include the ion-implanted defined nanorods 406 and / or the ion-implanted defined sensing region 408. Such an ion implantation process may further prevent damage to the superconducting layer 202.

[0109] In another example, using a substrate bonding process to place another type of electrode (e.g., wires 1206a, 1206b) above and below the ion implantation defined nanorods 406 and / or Majorana fermion device 2206 can facilitate improved wiring layout of a semiconductor and / or superconducting device (e.g., device 2200) that includes the Majorana fermion device 2206 and / or the ion implantation defined nanorods 406 by avoiding the use of competing substrate areas. In another example, using wafer (substrate) bonding techniques to separate the Majorana fermion device 2206 to create a suspended Majorana fermion device of device 2200 with one or more sides exposed to the hollow space 2204 of device 2200 can avoid the Majorana fermion device 2206 coming into contact with the silicon wafer or dielectric membrane of device 2200. Such suspension has the advantage of minimizing contact with other membranes of device 2200, which could cause defects, and also provides an area for forming wiring patterns (e.g., wires 1206a, 1206b) on at least two sides (e.g., on at least two faces) of Majorana fermion device 2206.

[0110] In another example, device 2200 and / or Majorana fermion device 2206 can include one or more extended electrode layers 1904 that can include quasiparticle gettering structures that can enable application of charges to ion implantation defining nanorods 406, where such charges can act as a barrier to repel quasiparticle electrons that may be in the vicinity of ion implantation defining nanorods 406 and / or ion implantation defining sensing region 408. A device 2200 and / or Majorana fermion device 2206 including such an extended electrode layer 1904 may thereby enable reduced defects and / or improved lifetime of the ion implanted defined nanorods 406 and / or the ion implanted defined sensing region 408 by preventing quasiparticle electrons from transferring to the ion implanted defined nanorods 406 and / or the ion implanted defined sensing region 408 and potentially destroying the coherence of the Majorana fermions.

[0111] Device 2200 and / or Majorana fermion device 2206 may provide technical improvements to processing units associated with device 2200 and / or Majorana fermion device 2206. For example, based on the examples provided above describing the fabrication of device 2200 and / or Majorana fermion device 2206 using methods and / or materials that protect elements of such devices (e.g., ion implantation defining nanorods 406, ion implantation defining sensing region 408, extended electrode layer 1208, suspension of Majorana fermion device 2206 in device 2200, etc.) from defects and / or damage, device 2200 and / or Majorana fermion device 2206 may prevent quenching of Majorana fermions. Based on such prevention of Majorana fermion quenching, device 2200 and / or Majorana fermion device 2206 may enable improved (e.g., longer) coherence times of such Majorana fermions, thereby facilitating improved processing performance of quantum computing devices (e.g., quantum processors) including device 2200 and / or Majorana fermion device 2206. Such improved processing performance of quantum computing devices (e.g., quantum processors) including device 2200 and / or Majorana fermion device 2206 may further facilitate faster and / or potentially universal quantum computing.

[0112] Device 2200 and / or Majorana Fermion device 2206 may be combined with hardware and / or software to solve problems that are highly technical in nature, not abstract, and not capable of being performed as a series of mental acts by a human. For example, device 2200 and / or Majorana Fermion device 2206 may be utilized in semiconductor devices (e.g., integrated circuits) used to realize quantum computing devices that process information and / or perform calculations that are not abstract and not capable of being performed as a series of mental acts by a human.

[0113] It should be appreciated that device 2200 and / or Majorana fermion device 2206 may utilize various combinations of electrical components, mechanical components, and circuitry that cannot be replicated or performed by the human mind. For example, facilitating suspended Majorana fermion devices including ion implantation defined nanorods in a semiconductor device may enable the operation of a quantum computing device (e.g., a quantum processor of a quantum computing device) to be beyond the capabilities of the human mind. For example, the amount of data processed, the speed at which such data is processed, or the type of data processed, or combinations thereof, over a particular period of time by such a quantum computing device utilizing device 2200 and / or Majorana fermion device 2206 may be greater, faster, or of different data types, or combinations thereof, than can be processed by the human mind over the same period of time.

[0114] According to some embodiments, device 2200 and / or Majorana Fermion device 2206 may further be fully operational toward performing one or more other functions (e.g., fully powered, fully running, etc.) while also performing the above operations. It should also be recognized that such simultaneous multi-operation performance is beyond the capabilities of the human mind. It should also be recognized that device 2200 and / or Majorana Fermion device 2206 may contain information that is not manually obtainable by an entity such as a human user. For example, the type, amount, or variety of information contained in device 2200 and / or Majorana Fermion device 2206 may be more complex than information that can be manually obtained by a human user.

[0115] 25 illustrates a flow diagram of an example non-limiting method 2500 that can facilitate implementing a suspended Majorana fermion device including ion implantation defined nanorods in a semiconductor device according to one or more embodiments described herein. Repeated descriptions of similar elements and / or similar processes utilized in other embodiments described herein are omitted for the sake of brevity.

[0116] Method 2500 can be implemented in a computing system (e.g., operating environment 2600 shown in FIG. 26 and described below) or computing device (e.g., computer 2612 shown in FIG. 26 and described below). In a non-limiting example embodiment, such a computing system (e.g., operating environment 2600) or such a computing device (e.g., computer 2612) or both can include one or more processors and one or more memory devices that can store executable instructions that, when executed by the one or more processors, can facilitate performing the operations described herein, including the non-limiting operations of method 2500 shown in FIG. 25. As a non-limiting example, the one or more processors can facilitate performing the operations described herein, such as method 2500, by directing and / or controlling one or more systems and / or apparatus operable to perform semiconductor fabrication.

[0117] At 2502, method 2500 may include forming (e.g., via computer 2612) an ion implantation region (e.g., ion implantation region 404) coupled to a Majorana fermion device (e.g., Majorana fermion device 2206) in a quantum computing device (e.g., device 2200, device 2400).

[0118] At 2504, method 2500 may include forming (e.g., via computer 2612) an encapsulation membrane (e.g., encapsulation membrane 1404) coupled to the ion implantation region and a substrate layer (e.g., second substrate layer 1504) to suspend a Majorana fermion device in a quantum computing device (e.g., as described above with reference to Figures 22A and 22B).

[0119] For ease of explanation, the methodologies (e.g., computer-implemented methods) described herein are shown and described as a series of operations. It is to be understood and appreciated that the subject innovation is not limited by the operations and / or order of operations shown, e.g., operations may occur in various orders or simultaneously, or both, as well as with other operations not shown and described herein. Moreover, not all illustrated operations may be required to implement the methodologies (e.g., computer-implemented methods) described herein in accordance with the subject matter of the present disclosure. In addition, those skilled in the art will understand and appreciate that such methods may alternatively be represented as a series of interrelated states via a state diagram or events. Additionally, it should be further appreciated that the methodologies (e.g., computer-implemented methods) disclosed below and throughout this specification can be stored in an article of manufacture to facilitate transport and transfer of such methodologies (e.g., computer-implemented methods) to a computer. The term article of manufacture, as used herein, is intended to encompass a computer program accessible from any computer-readable device or storage medium.

[0120] To provide background for various aspects of the subject matter of the present disclosure, Fig. 26 as well as the following description are intended to provide an overview of a suitable environment in which various aspects of the subject matter of the present disclosure may be implemented. Fig. 26 illustrates a block diagram of an example non-limiting operating environment that may facilitate one or more embodiments described herein. For example, the operating environment 2600 may be used to implement the example non-limiting method 2500 of Fig. 25 that may facilitate implementing one or more embodiments of the present disclosure described herein. Repeated descriptions of similar elements and / or similar processes utilized in other embodiments described herein are omitted for the sake of brevity.

[0121] 26, a suitable operating environment 2600 for implementing various aspects of the disclosure may further include a computer 2612. The computer 2612 may further include a processing unit 2614, a system memory 2616, and a system bus 2618. The system bus 2618 couples system components including, but not limited to, the system memory 2616 to the processing unit 2614. The processing unit 2614 may be any of a variety of available processors. Dual microprocessors and other multi-processor architectures may also be utilized as the processing unit 2614. The system bus 2618 may be any of several types of bus structures including a memory bus or memory controller, a peripheral bus or external bus, and / or a local bus using any kind of available bus architecture, including, but not limited to, Industry Standard Architecture (ISA), MicroChannel Architecture (MSA), Enhanced ISA (EISA), Intelligent Drive Electronics (IDE), VESA Local Bus (VLB), Peripheral Component Interconnect (PCI), Card Bus, Universal Serial Bus (USB), Advanced Graphics Port (AGP), Firewire (IEEE 1394), and Small Computer System Interface (SCSI).

[0122] The system memory 2616 may further include a volatile memory 2620 and a non-volatile memory 2622. A basic input / output system (BIOS), containing the basic routines for transferring information between elements within the computer 2612, such as during start-up, is stored in the non-volatile memory 2622. The computer 2612 may further include removable / non-removable, volatile / non-volatile computer storage media. FIG. 26 illustrates, for example, disk storage 2624. The disk storage 2624 may further include devices such as, but not limited to, a magnetic disk drive, a floppy disk drive, a tape drive, a Jaz drive, a Zip drive, an LS-100 drive, a flash memory card, or a memory stick. The disk storage 2624 may also include storage media, either separately or in combination with other storage media. To facilitate connection of the disk storage 2624 to the system bus 2618, a removable or non-removable interface, such as interface 2626, is typically used. 26 further illustrates software that acts as an intermediary between users and the basic computer resources described in suitable operating environment 2600. Such software may further include, for example, an operating system 2628. The operating system 2628, which may be stored on disk storage 2624, functions to control and allocate resources of the computer 2612.

[0123] System applications 2630 take advantage of the management of resources by operating system 2628 via program modules 2632 and program data 2634 stored, for example, in either system memory 2616 or disk storage 2624. It should be appreciated that the present disclosure may be implemented with various operating systems or combinations of operating systems. A user enters commands or information into computer 2612 through input devices 2636. Input devices 2636 include, but are not limited to, pointing devices such as a mouse, trackball, stylus, touch pad, keyboard, microphone, joystick, game pad, satellite dish, scanner, television tuner card, digital camera, digital video camera, webcam, and the like. These and other input devices are coupled to processing unit 2614 through system bus 2618 via interface ports 2638. Interface ports 2638 include, for example, serial ports, parallel ports, game ports, and a universal serial bus (USB). The output devices 2640 use some of the same types of ports as the input devices 2636. Thus, for example, a USB port can be used to provide input to the computer 2612 and output information from the computer 2612 to the output devices 2640. Output adapters 2642 are provided to illustrate that there are some output devices 2640, such as monitors, speakers, and printers, among other output devices 2640, that require special adapters. Output adapters 2642 include, by way of example and not limitation, video and sound cards that provide a means of connection between the output devices 2640 and the system bus 2618. It should be noted that other devices and / or systems of devices may include both input and output capabilities, such as the remote computer 2644.

[0124] The computer 2612 can operate in a networked environment using logical connections to one or more remote computers, such as a remote computer 2644. The remote computer 2644 can be a computer, a server, a router, a network PC, a workstation, a microprocessor-based device, a peer device, or other common network node, and generally can further include many or all of the elements described with respect to the computer 2612. For simplicity, only a memory storage device 2646 is shown with the remote computer 2644. The remote computer 2644 is logically connected to the computer 2612 through a network interface 2648, and then physically connected via a communication connection 2650. The network interface 2648 encompasses wired and / or wireless communication networks, such as a local area network (LAN), a wide area network (WAN), a cellular network, and the like. LAN technologies include Fiber Distributed Data Interface (FDDI), Copper Distributed Data Interface (CDDI), Ethernet, Token Ring, and the like. WAN technologies include, but are not limited to, point-to-point links, circuit-switched networks such as Integrated Services Digital Networks (ISDN) and variations thereon, packet-switched networks, and Digital Subscriber Lines (DSL). Communications connection 2650 refers to the hardware / software utilized to connect network interface 2648 to system bus 2618. Communications connection 2650 is shown internal to computer 2612 for clarity of illustration, but can be external to computer 2612. Hardware / software for connection to network interface 2648 can further include, by way of example only, internal and external technologies such as modems, including ordinary telephone-grade modems, cable modems, and DSL modems, ISDN adapters, and Ethernet cards.

[0125] The present invention may be a system, method, apparatus, or computer program product, or combinations thereof, at any possible level of integration of technical details. The computer program product may include a computer readable storage medium (or media) having computer readable program instructions for causing a processor to execute aspects of the present invention. The computer readable storage medium may be a tangible device capable of holding and storing instructions for use in an instruction execution device. The computer readable storage medium may be, for example, but not limited to, an electronic storage device, a magnetic storage device, an optical storage device, an electromagnetic storage device, a semiconductor storage device, or any suitable combination of the foregoing. A non-exhaustive list of more specific examples of computer readable storage media may further include the following: portable computer diskettes, hard disks, random access memory (RAM), read only memory (ROM), erasable programmable read only memory (EPROM or flash memory), static random access memory (SRAM), portable compact disk read only memory (CD-ROM), digital versatile disk (DVD), memory sticks, floppy disks, mechanically encoded devices such as punch cards or raised structures in grooves in which instructions are recorded, and suitable combinations of the foregoing. Computer readable storage media as used herein should not be construed as being ephemeral signals per se, such as radio waves or other freely propagating electromagnetic waves, electromagnetic waves propagating through wave guides or other transmission media (e.g., light pulses passing through fiber optic cables), or electrical signals transmitted through wires.

[0126] The computer readable program instructions described herein may be downloaded from a computer readable storage medium to the respective computing / processing device or to an external computer or external storage device via a network, such as the Internet, a local area network, a wide area network, or a wireless network, or a combination thereof. The network may include copper transmission cables, optical transmission fiber, wireless transmission, routers, firewalls, switches, gateway computers, or edge servers, or a combination thereof. A network adapter card or network interface of each computing / processing device receives the computer readable program instructions from the network and forwards the computer readable program instructions for storage in a computer readable storage medium within the respective computing / processing device. The computer readable program instructions for performing the operations of the present invention may be either source code or object code written in any combination of one or more programming languages, including object-oriented programming languages ​​such as Smalltalk, C++, and the like, and procedural programming languages ​​such as the "C" programming language or similar programming languages. The computer readable program instructions may execute entirely on the user's computer, partially on the user's computer, as a stand-alone software package, partially on the user's computer and partially on a remote computer, or entirely on a remote computer or server.In the latter scenario, the remote computer may be connected to the user's computer through any type of network, including a local area network (LAN) or wide area network (WAN), or the connection may be made to an external computer (e.g., through the Internet using an Internet Service Provider). In some embodiments, electronic circuitry, including, for example, programmable logic circuits, field programmable gate arrays (FPGAs), or programmable logic arrays (PLAs), may execute computer readable program instructions by utilizing state information of the computer readable program instructions to personalize the electronic circuitry to perform aspects of the present invention.

[0127] Aspects of the present invention are described herein with reference to flowchart illustrations and / or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the invention. It will be understood that each block of the flowchart illustrations and / or block diagrams, and combinations of blocks in the flowchart illustrations and / or block diagrams, may be implemented by computer-readable program instructions. These computer-readable program instructions may be provided to a processor of a general purpose computer, special purpose computer, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via a processor of the computer or other programmable data processing apparatus, create means for performing the functions / operations specified in one or more blocks of the flowchart illustrations and / or block diagrams. These computer-readable program instructions may also be stored on a computer-readable storage medium that can instruct a computer, programmable data processing apparatus, or other device, or combination thereof, to function in a particular manner, such that the computer-readable storage medium on which the instructions are stored constitutes a product containing instructions implementing aspects of the functions / operations specified in one or more blocks of the flowchart illustrations and / or block diagrams. The computer readable program instructions may also be loaded into a computer, other programmable data processing apparatus, or other device to cause the computer, other programmable apparatus, or other device to perform a series of operational steps to generate a computer-implemented process, such that the instructions, which execute on the computer, other programmable apparatus, or other device, perform the functions / operations specified in one or more blocks of the flowcharts and / or block diagrams.

[0128] The flowcharts and block diagrams in the figures illustrate the architecture, functionality, and operation of possible implementations of systems, methods, and computer program products according to various embodiments of the present invention. In this regard, each block in the flowcharts or block diagrams may represent a module, segment, or portion of instructions that includes one or more executable instructions for implementing a specified logical function. In some alternative implementations, the functions noted in the blocks may occur out of the order noted in the figures. For example, two blocks shown in succession may in fact be executed substantially simultaneously, or the blocks may sometimes be executed in reverse order depending on the functionality involved. It should also be noted that each block of the block diagrams and / or flowcharts, and combinations of blocks in the block diagrams and / or flowcharts, may be implemented by a dedicated hardware-based system that executes the specified functions or operations or executes a combination of dedicated hardware instructions and computer instructions.

[0129] Although the subject matter has been described above in the general context of computer-executable instructions of a computer program product executed on one or more computers or both, those skilled in the art will recognize that the present disclosure can also be implemented or embodied in combination with other program modules. Generally, program modules include routines, programs, components, data structures, etc., that perform particular tasks and / or implement particular abstract data types. Moreover, those skilled in the art will recognize that the computer-implemented methods of the present invention may be practiced with other computer system configurations including single-processor or multi-processor computer systems, minicomputing devices, mainframe computers, as well as computers, handheld computing devices (e.g., PDAs, phones), microprocessor-based or programmable consumer or industrial electronic devices, and the like. Illustrated aspects may also be practiced in distributed computing environments where tasks are performed by remote processing devices that are linked through a communications network. However, some, if not all, aspects of the present disclosure may be practiced on stand-alone computers. In a distributed computing environment, program modules may be located in both local and remote memory storage devices.

[0130] As used in this application, terms such as "component," "system," "platform," "interface," and the like, may refer to and / or include computer-related entities or entities related to an operational machine having one or more specific functions. The entities disclosed herein may be either hardware, a combination of hardware and software, software, or software in execution. For example, a component may be, but is not limited to, a process running on a processor, a processor, an object, an executable, a thread of execution, a program, or a computer, or combinations thereof. As an example, both an application running on a server and the server may be a component. One or more components may reside within a process and / or thread of execution, and a component may be localized on one computer or distributed between two or more computers, or both. In another example, each component may execute from various computer readable media having various data structures stored thereon. A component may communicate via local and / or remote processes, such as by signals having one or more data packets (e.g., data from one component interacting with another component in a local system, a distributed system, or data from one component interacting with other systems via signals over a network such as the Internet). As another example, a component may be a device with a particular function provided by mechanical parts operated by electrical or electronic circuits operated by a software or firmware application executed by a processor. In such cases, the processor may be internal or external to the device and may execute at least a portion of the software or firmware application.As yet another example, a component may be a device that provides a particular function without mechanical parts through electronic components, where the electronic components may include a processor or other means for executing software or firmware that provides at least part of the functionality of the electronic components. In one aspect, a component may emulate an electronic component via a virtual machine, for example within a cloud computing system.

[0131] In addition, the term "or" is intended to mean an inclusive "or" rather than an exclusive "or." That is, unless otherwise specified or clear from the context, "X utilizes A or B" is intended to mean any of the natural inclusive permutations. That is, if X utilizes A, X utilizes B, or X utilizes both A and B, then "X utilizes A or B" is satisfied under any of the foregoing examples. Moreover, the articles "a" and "an" used in the subject specification and accompanying drawings should generally be construed to mean "one or more" unless otherwise specified or clear from the context that the singular form is intended. As used herein, the terms "example" and / or "exemplary" are utilized to mean serving as an example, instance, or illustration. For clarity, the subject matter disclosed herein is not limited by such examples. Additionally, any aspect or design described herein as "example" and / or "exemplary" is not necessarily to be construed as preferred or advantageous over other aspects or designs, or is not meant to exclude equivalent exemplary structures and techniques known to those skilled in the art.

[0132] The term "processor" as utilized in the subject specification may refer to virtually any computing processing unit or device, including, but not limited to, a single core processor, a single processor with software multithreaded execution capability, a multicore processor, a multicore processor with software multithreaded execution capability, a multicore processor with hardware multithreading technology, a parallel platform, and a parallel platform with distributed shared memory. Additionally, a processor may refer to an integrated circuit, an application specific integrated circuit (ASIC), a digital signal processor (DSP), a field programmable gate array (FPGA), a programmable logic controller (PLC), a complex programmable logic device (CPLD), discrete gate or transistor logic, discrete hardware components, or any combination thereof, designed to perform the functions described herein. Furthermore, a processor may utilize nanoscale architectures, such as, but not limited to, molecular and quantum dot-based transistors, switches, and gates, to optimize space usage or improve the performance of user equipment. A processor may also be implemented as a combination of computing processing units. In this disclosure, terms such as "store," "storage," "data store," "data storage," "database," and substantially any other information storage component that relate to the operation and functionality of the component are utilized to refer to a "memory component," an entity embodied in a memory, or a component that includes a memory. It should be appreciated that the memory and / or memory components described herein can be either volatile or non-volatile memory, or can include both volatile and non-volatile memory.By way of example, and not limitation, non-volatile memory may include read only memory (ROM), programmable ROM (PROM), electrically programmable ROM (EPROM), electrically erasable ROM (EEPROM), flash memory, or non-volatile random access memory (RAM) (e.g., ferroelectric RAM (FeRAM)). Volatile memory may include, for example, RAM, which may act as external cache memory. By way of example, and not limitation, RAM is available in many forms, such as synchronous RAM (SRAM), dynamic RAM (DRAM), synchronous DRAM (SDRAM), double data rate SDRAM (DDR SDRAM), enhanced SDRAM (ESDRAM), SyncLink DRAM (SLDRAM), Direct Rambus RAM (DRRAM), Direct Rambus Dynamic RAM (DRDRAM), and Rambus Dynamic RAM (RDRAM). Additionally, the disclosed memory components of the systems or computer-implemented methods herein are intended to include, but are not limited to, these and any other suitable types of memory.

[0133] The foregoing includes merely examples of systems and computer-implemented methods. Of course, it is not possible to describe every conceivable combination of components or computer-implemented methods in order to describe this disclosure, but one of ordinary skill in the art may recognize that many further combinations and permutations of the present disclosure are possible. Furthermore, to the extent that terms such as "includes," "has," "possesses," and the like are used in the detailed description, claims, appendices, and drawings, such terms are intended to be as inclusive as the terms "comprising" and "comprising" are interpreted when used as transitional terms in the claims.

[0134] The description of various embodiments is presented for illustrative purposes and is not intended to be exhaustive or limited to the disclosed embodiments. Many variations and modifications will be apparent to those skilled in the art without departing from the scope and spirit of the described embodiments. The terms used in this specification are selected to best explain the principles of the embodiments, practical applications, or technical improvements beyond the technology found in the market, or to allow those skilled in the art to understand the embodiments disclosed herein.

Claims

1. 1. A quantum computing device, comprising: a Majorana fermion device coupled to the ion implanted region; an encapsulation membrane coupled to the ion implanted region and to a substrate layer, the encapsulation membrane suspending the Majorana fermion device in the quantum computing device.

2. The device of claim 1 , wherein the Majorana fermion device comprises an ion-implanted defined nanorod.

3. The device of claim 1 or 2, wherein the Majorana fermion device comprises a superconducting layer.

4. The Majorana fermion device comprises: a superconducting layer coupled to the ion implanted defining nanorods; an oxidation-free interface between the ion-implanted defining nanorods and the superconducting layer; 4. A device according to claim 1, comprising:

5. 5. The device of claim 1, wherein the Majorana fermion device comprises at least one ion-implanted defined sensing region that includes at least one quantum dot.

6. 6. The device of claim 1, further comprising an extended electrode layer coupled to the Majorana fermion device that repels unwanted quasiparticles from the Majorana fermion device.

7. The device of claim 6 , wherein the extended electrode layer includes a quasiparticle gettering structure.

8. 8. The device of claim 6 or 7, wherein the extended electrode layer comprises a width ranging from about 300 nm to about 5000 nm, or a length ranging from about 300 nm to about 5000 nm, or both.

9. 9. The device of claim 1, further comprising one or more wires coupled to the Majorana fermion device, the one or more wires being selected from the group consisting of control wires, tunnel junction gates, pinch gates, chemical potential control gates, sense wires, semiconductor connectors, electrodes, circuit wires of the device, and contacts.

10. 10. The device of claim 1, wherein one or more sides of the Majorana fermion device are exposed to a hollow space of the quantum computing device to prevent direct contact of the Majorana fermion device with at least one of the substrate layer or dielectric film of the quantum computing device, thereby promoting at least one of reducing quasiparticle generation in the Majorana fermion device, improving performance of the Majorana fermion device, or improving lifetime of the Majorana fermion device.

11. forming an ion implant region coupled to a Majorana fermion device in a quantum computing device; forming an encapsulation layer coupled to the ion implanted region and a substrate layer to suspend the Majorana fermion device in the quantum computing device; The method includes:

12. growing nanorods on a semiconductor layer of the quantum computing device using an epitaxial film growth process; growing the superconducting layer on the nanorods using the epitaxial film growth process to form an oxide-free interface between the nanorods and the superconducting layer; The method of claim 11 further comprising:

13. defining at least one conductive region of a nanorod of said Majorana fermion device using an ion implantation process; 13. The method of claim 11 or 12, further comprising:

14. defining at least one sensing region, including at least one quantum dot, in the nanorod of the Majorana fermion device using an ion implantation process; 14. The method of claim 11, further comprising:

15. coupling an extended electrode layer to the Majorana fermion device to repel unwanted quasiparticles from the Majorana fermion device; 15. The method of any of claims 11 to 14, further comprising:

16. removing one or more portions of at least one of the ion implanted region or the encapsulation film from the quantum computing device to expose one or more sides of the Majorana fermion device to a hollow volume of the quantum computing device to prevent direct contact of the Majorana fermion device with at least one of the substrate layer or dielectric film of the quantum computing device, thereby facilitating at least one of reducing quasiparticle generation in the Majorana fermion device, improving performance of the Majorana fermion device, or improving lifetime of the Majorana fermion device.

16. The method of any of claims 11 to 15, further comprising:

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