16results about "Dissimilar materials junction devices" patented technology

To provide a superconducting circuit capable of reducing crosstalk.SOLUTION: A superconducting circuit (1) includes: a ground plane (30) that has a superconducting member; multiple superconducting parts (10) surrounded at intervals from the ground plane by non-conducting parts (40), the multiple superconducting parts each having four coupling ports that interact with the other superconducting parts; a superconducting quantum interference device (12) that sets the resonance frequency of the first superconducting part included in the multiple superconducting parts; and a three-dimensional wiring that forms a superconducting loop surrounding the superconducting quantum interference device with the ground plane. The superconducting quantum interference device is placed in a position where a magnetic field is applied by a current from the bias line (13G) to the first superconducting part in the region within the superconducting loop.SELECTED DRAWING: Figure 3

To enable a large number of control objects to be controlled by a small number of control lines.SOLUTION: A magnetic flux bias circuit comprises: an input signal line to which an input signal indicating an applied magnetic flux by a digital value is inputted; a first, a second and a third current control line to which clock signals corresponding to input signals are inputted, respectively; a digital-analog conversion unit for converting, on the basis of an input signal inputted to the input signal line and clock signals inputted to the first, second and third current control lines, respectively, the input signal into an analog signal by a circuit that includes a fluxoid quantum parametron circuit; and a magnetic flux application unit for applying an applied magnetic flux to the control object on the basis of the analog signal outputted from the digital-analog conversion unit.SELECTED DRAWING: Figure 12

The chip surface-based device structure comprises a first superconducting material physically bonded to a crystalline substrate, the crystalline substrate physically bonded to a second superconducting material, the second superconducting material physically bonded to the second crystalline substrate; and in one embodiment, the chip surface-based device structure comprises a vertical Josephson junction positioned in a via in the crystalline substrate, the vertical Josephson junction comprising the first superconducting material, a tunnel barrier, and a second superconducting material; and in one embodiment, the chip surface-based device structure comprises a vertical transmon qubit device comprising a transmon qubit comprising the vertical Josephson junction and a capacitor formed between the first superconducting material and the second superconducting material.

A computing device is provided that includes a magnetic Josephson junction with an embedded magnetic field control element. An on-chip magnetic field control device is formed adjacent to a Josephson junction (JJ) structure. The on-chip magnetic field control device includes a wiring structure disposed laterally adjacent to the JJ structure. In some embodiments, the magnetic field control device also includes, in addition to the wiring structure, a conductive plate connected to the wiring structure and disposed below the JJ structure. Using a current through the wiring structure directly or indirectly induces a magnetic field into the JJ structure. The strength of the field is modulated by the amount of current passing through the wiring structure. The magnetic field can be stopped as needed by not allowing current to flow through the wiring structure.

To provide a superconducting quantum circuit device with high scalability in terms of scale, etc., and capable of adjusting coupling strength.SOLUTION: A superconducting quantum circuit device comprises: a SQUID (superconducting quantum interference device) in which a first superconducting line, a first Josephson junction, a second superconducting line, and a second Josephson junction are connected in a loop; two or four Josephson parametric oscillators, each of which includes a line supplying magnetic flux interlinking with the loop of the SQUID, and parametrically oscillating according to a pump signal supplied to the line; and a combiner combining the two or four Josephson parametric oscillators, the superconducting quantum circuit device further comprises means for varying the strength of the two-body or four-body interaction by varying the relative phase between the pump signals respectively supplied to the lines of the two or four Josephson parametric oscillators for parametric oscillation.SELECTED DRAWING: Figure 2A

Quantum computing systems require methods to control energies of qubits and couplers for quantum operations. Flux biasing of qubits and quantum couplers is provided for a superconducting quantum computer using single-flux-quantum (SFQ) technology. This method is applicable to a wide range of superconducting qubit structures and couplers, including transmons, fluxoniums, flux qubits, phase qubits and other superconducting qubits. This method enables arbitrary-amplitude time-varying flux biasing of qubits and couplers, due to a sequence of high-speed SFQ pulses. Several preferred embodiments are disclosed which provide high-fidelity control of fast single-qubit and multi-qubit operations.

To provide an electronic circuit and a calculation device capable of improving characteristics.SOLUTION: An electronic circuit includes a first quantum bit, a second quantum bit, a first coupler, a first reading conductive member, and a first filter. The first coupler includes a first resonator and a second resonator. The first resonator can be coupled with the first quantum bit. The second resonator can be coupled with the second quantum bit. The first filter includes a first filter portion, a first other filter portion, and a first reading portion. The first filter portion can be coupled with the first resonator. The first other filter portion can be coupled with the second resonator. The first reading portion can be coupled with the first reading conductive member.SELECTED DRAWING: Figure 1

In a general aspect, a microwave quantum circuit includes an on-chip impedance matching circuit. In some cases, a microwave quantum circuit includes a dielectric substrate, a quantum circuit device on the substrate, and an impedance matching circuit device on the substrate. The quantum circuit device includes a Josephson junction, and the impedance matching circuit device is coupled to the quantum circuit device on the substrate.

Techniques are described to construct an electromagnetic resonator by arranging a resonant structure within a superconducting cavity. The architecture of the design may provide a low loss superconducting cavity resonator that may exhibit multiple modes. The multimode nature of this resonator is produced in part by the resonant structure in such a way that allows the modes of the resonator to be adjusted through adjustment of the resonant structure rather than by having to alter the physical dimensions of the cavity, as would otherwise be required in a conventional superconducting cavity resonator. In some embodiments, the resonant structure may include a suspended superconductor comprising metal and / or metallized parts.

Techniques are provided for qubit devices comprising silicon-based Josephson junctions, and / or for fabricating qubit devices comprising silicon-based Josephson junctions. For example, one or more embodiments described herein may comprise a device that may include a Josephson junction that includes a tunnel barrier disposed between two vertically stacked superconducting silicon electrodes.

A superconducting quantum interference apparatus comprising a planar array of loops where each loop constitutes a superconducting quantum interference device, and a magnetic shield disposed over part of one of the loops so to protect the covered part of the loop from exposure to a magnetic field.

One or more systems, devices, methods of use and / or methods of fabrication provided herein relate to a device that can facilitate qubit measurement with isolation imposed between a quantum processor and a respective qubit measurement circuit and / or which respective qubit measurement circuit can have a small footprint, such as within a respective cryogenic chamber of a quantum system. According to one embodiment, a device comprises an isolator circuit having a bandpass filter configuration coupled between a pair of ports and the bandpass filter configuration comprising two or more poles. Two or more shunt resonators can be realized as the two or more poles, wherein the two or more shunt resonators can comprise DC SQUIDs and can be coupled together with one or more admittance inverters. A non-reciprocal signal transmission can be generated between the two ports by RF pumping the DC SQUIDs.

To provide a superconducting quantum circuit including four-body interaction coupler that has an excellent noise resistance characteristic and is applicable to an actual application.SOLUTION: A four-body interaction coupler, in a planer circuit configuration, comprises a first electrode and a second electrode disposed facing each other and away from a circumambient ground pattern, the first electrode being provided with a first facing part and a second facing part that extend from a portion of the first electrode different from the side facing the second electrode toward sides of a first quantum bit and a second quantum bit, respectively, the second electrode being provided with a first facing part and a second facing part that extend from a portion of the second electrode different from the side facing the first electrode toward sides of third quantum bit and forth quantum bit, respectively, and provided with a non-liner device including a Josephson junction crosslinking the first electrode and the second electrode, at least one of a gap width between the first electrode and the ground pattern facing the first electrode and a gap width between the second electrode and the ground pattern facing the second electrode is set to a value equal to or a fraction of a size of the first electrode or the second electrode.SELECTED DRAWING: Figure 3

An active cooling structure is provided that includes a non-superconducting layer, a superconducting layer, and an array of superconductor-insulator-normal metal (NIS) tunnel junctions. The non-superconducting layer can include a plurality of non-superconducting traces. The superconducting layer can include a plurality of superconducting traces. The array of superconductor-insulator-normal metal (NIS) tunnel junctions can be disposed between the plurality of non-superconducting traces and the plurality of superconducting traces.

This disclosure relates to optical devices for quantum information processing applications. In one example implementation, a semiconductor structure is provided. The semiconductor structure may be embedded with single defects that can be individually addressed. An electric bias and / or one or more optical excitations may be configured to control the single defects in the semiconductor structure to produce single photons for use in quantum information processing. The electric bias and optical excitations are selected and adjusted to control various carrier processes and to reduce environmental charge instability of the single defects to achieve optical emission with wide wavelength tunability and narrow spectral linewidth. Electrically controlled single photon source and other electro-optical devices may be achieved.

A method for fabricating a bridge structure in a quantum mechanical device includes providing a substructure including a substrate having deposited thereon a layer of a first superconducting material divided into a first portion, a second portion, and a third portion electrically insulated from one another; depositing a sacrificial layer over the substructure; electrically connecting the first portion and the second portion with a strip of a second superconducting material, the second superconducting material being different from the first superconducting material; and removing a portion of the sacrificial layer to form a bridge structure over the third portion between the first and second portions, the bridge structure electrically connecting the first portion to the second portion but not electrically connecting the third portion to the first portion and not electrically connecting the third portion to the second portion.