An integrated ion trap system

Abstract

The invention discloses an integrated ion trap system, comprising: a mounting platform, an ion trap packaging module and a bracket are arranged on the mounting platform, an objective lens is arranged on the bracket; a photon window is arranged on the surface of the ion trap packaging module, and the objective lens is opposite to the photon window. The integrated ion trap system of the invention realizes the integration of the ion trap system, greatly reduces the overall size of the system, greatly reduces the demand for low-temperature cooling of the entire system, and due to the reduction of the overall size of the system, the working distance of the objective lens is also shortened, thereby improving the photon collection efficiency.

Description

Technical Field

[0001] The present invention relates to the field of quantum computing technology, and in particular to an integrated ion trap system. Background Art

[0002] In the field of quantum computing, ion trap technology based on trapped ions is one of the mainstream technical paths to achieve quantum computing. It uses ions cooled to the ground state as quantum bits, and uses lasers to manipulate and read quantum bits. In order to improve the trapped stability of ions and extend the coherence time of quantum bits, it is often necessary to place ion traps in ultra-high vacuum chambers. In order to further reduce the collision of gas molecules with trapped ions, the use of ultra-low temperature technology to cool ion traps to the liquid helium temperature zone has been applied in the industry. On the one hand, ion traps in the liquid helium temperature zone can further improve the vacuum degree of the vacuum chamber and reduce residual gas molecules. On the other hand, they can reduce the heating rate of ion crystals and increase the duration of ion crystals, thereby extending the coherence time of quantum bits and greatly improving the fidelity of quantum logic gates.

[0003] Since ion traps require high-precision DC and RF signals to work, when the ion trap is placed in an ultra-low temperature vacuum environment, the electrical design and wiring around the trap need to be considered. At the same time, the ion trap requires multi-angle laser incidence and efficient photon collection, so the laser channel and objective lens system design are also required. The current ultra-low temperature ion trap system has problems such as large equipment, messy and complex wiring in the cavity, and low photon collection efficiency. Summary of the invention

[0004] In order to overcome the deficiencies of the prior art, an object of the present invention is to provide an integrated ion trap system which can reduce the overall size of the system.

[0005] The purpose of the present invention is achieved by the following technical solutions:

[0006] An integrated ion trap system comprises: a mounting platform, on which an ion trap packaging module and a bracket are arranged, on which an objective lens is arranged; a photon window is arranged on the surface of the ion trap packaging module, and the objective lens is opposite to the photon window.

[0007] Furthermore, the ion trap packaging module includes a shell, which is cylindrical, with an upper cover and a mounting plate installed at both ends of the shell respectively, a plurality of laser windows are arranged on the surface of the shell, the photon window is arranged on the upper cover, and the mounting plate is connected to the mounting platform.

[0008] Furthermore, a planar driving mechanism is installed between the mounting platform and the ion trap packaging module, and the planar driving mechanism is used to drive the ion trap packaging module to move on a plane parallel to the mounting platform surface.

[0009] Furthermore, a linear drive mechanism is installed between the bracket and the objective lens, and the linear drive mechanism is used to drive the objective lens to approach or move away from the mounting platform in a direction perpendicular to the surface of the mounting platform.

[0010] Furthermore, the lower end of the bracket is fixed on the mounting table, and the upper end of the bracket is connected to the linear drive mechanism, and the linear drive mechanism is connected to an objective lens positioning ring. The linear drive mechanism is used to drive the objective lens positioning ring to approach or move away from the mounting table in a direction perpendicular to the table surface of the mounting table, and the objective lens is installed in the objective lens positioning ring.

[0011] Furthermore, the planar driving mechanism and the linear driving mechanism are both piezoelectric displacement stages.

[0012] Furthermore, a resonator and a DC filter are also provided on the mounting platform, and the resonator and the DC filter are respectively connected to the ion trap packaging module signal.

[0013] Furthermore, the mounting platform includes a first mounting plate and a second mounting plate which are spaced apart, and two oppositely arranged first support plates and a second support plate which connect the first mounting plate and the second mounting plate; the ion trap packaging module, the bracket and the DC filter are all arranged on the top surface of the first mounting plate, the resonator is installed on the top surface of the second mounting plate, winding poles are arranged on the outer sides of the first support plate and the second support plate, and a first cold head is connected to the bottom surface of the second mounting plate, and the first cold head is used to be connected to a cold source.

[0014] Furthermore, the integrated ion trap system also includes a blackbody radiation shielding shell, the mounting platform, the ion trap packaging module, the bracket and the objective lens are all located inside the blackbody radiation shielding shell, the blackbody radiation shielding shell is in the shape of a cylinder with one end closed, the side of the blackbody radiation shielding shell is provided with optical windows corresponding one to one with the laser windows, and the closed end of the blackbody radiation shielding shell is provided with an objective lens window opposite to the photon window.

[0015] Furthermore, a non-enclosed end of the blackbody radiation shielding shell is connected to a base, a wire outlet is provided on the base, and an end of the base away from the blackbody radiation shielding shell is connected to a second cold head, and the second cold head is used to connect to a cold source.

[0016] Compared with the prior art, the beneficial effect of the present invention is that the ion trap packaging module, the objective lens, and the bracket connecting the objective lens and the mounting platform are all integrated on the mounting platform, realizing the integration of the ion trap system, thereby greatly reducing the overall size of the system, and greatly reducing the demand for low-temperature cooling for the entire system. In addition, due to the reduction in the overall size of the system, the working distance of the objective lens is also shortened, thereby improving the photon collection efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 is a three-dimensional schematic diagram of the integrated ion trap system of the present invention;

[0018] Figure 2 An exploded view of the integrated ion trap system of the present invention;

[0019] Figure 3 for Figure 1 Schematic diagram after removing the blackbody radiation shielding shell, base and second cold head.

[0020] In the figure: 1. mounting table; 11. first mounting plate; 12. second mounting plate; 13. first supporting plate; 14. second supporting plate; 15. winding column; 16. first cold head; 2. ion trap packaging module; 21. photon window; 22. laser window; 3. bracket; 4. objective lens; 5. planar driving mechanism; 6. linear driving mechanism; 7. objective lens positioning ring; 8. resonator; 9. DC filter; 100. blackbody radiation shielding shell; 101. optical window; 102. objective lens window; 110. base; 111. outlet; 120. second cold head. DETAILED DESCRIPTION

[0021] In order to facilitate the understanding of the present invention, the present invention will be described more fully below with reference to the relevant drawings. Preferred embodiments of the present invention are provided in the drawings. However, the present invention can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the understanding of the disclosure of the present invention more thorough and comprehensive.

[0022] It should be noted that when an element is referred to as being "fixed to" another element, it may be directly on the other element or there may be a central element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are for illustrative purposes only.

[0023] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art of the present invention. The terms used herein in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The term "and / or" used herein includes any and all combinations of one or more related listed items.

[0024] like Figure 2-3 As shown, an integrated ion trap system provided by an embodiment of the present invention is shown, which at least includes a mounting platform 1, on which an ion trap packaging module 2 and a bracket 3 are arranged, and an objective lens 4 is arranged on the bracket 3; a photon window 21 is arranged on the surface of the ion trap packaging module 2, and the objective lens 4 is opposite to the photon window 21. The ion trap packaging module 2 can generate photons, and the photons can enter the objective lens 4 from the photon window 21 and be exported to the external imaging system by the objective lens 4. When in use, the integrated ion trap system of the present invention needs to be fixedly installed as a whole in an ultra-low temperature vacuum chamber (not shown), and the temperature of the ultra-low temperature vacuum chamber specifically needs to be controlled between 4K and 77K.

[0025] In the above-mentioned configuration, the ion trap packaging module 2, the objective lens 4, and the bracket 3 connecting the objective lens 4 and the mounting platform 1 are all integrated on the mounting platform 1, realizing the integration of the ion trap system, thereby greatly reducing the overall size of the system, and greatly reducing the demand for low-temperature cooling of the entire system. In addition, due to the reduction in the overall size of the system, the working distance of the objective lens 4 is also shortened, thereby improving the photon collection efficiency.

[0026] In some embodiments, the ion trap packaging module 2 includes a shell, the shell is cylindrical, and an upper cover plate and a mounting plate are installed at both ends of the shell, a plurality of laser windows 22 are arranged on the surface of the shell, a photon window 21 is arranged on the upper cover plate, and the mounting plate is connected to the mounting platform 1. Among them, the laser window 22 is used for the injection of laser, and the photon window 21 is used for the emission of photons. Specifically, the laser should complete the corresponding frequency stabilization, modulation, shaping and focusing outside the ultra-low temperature vacuum cavity, and inject from the laser window 22 after focusing. More specifically, an ion trap and an atomic generator are arranged in the shell, and the atomic generator can be excited to produce atomic vapor. There are a large number of atoms in the atomic vapor. The atoms can be ionized to produce ions, and the ions are trapped in the ion trap. When the trapped ions form ion crystals in an ultra-low temperature vacuum environment, lasers can be used to excite ion transitions. At this time, the ions will spontaneously radiate photons, and the photons are emitted from the photon window 21. It should be noted that the detailed principle of the process in which the atom generator generates atoms, the atoms are ionized to generate ions, and the ions transition under the action of the laser and spontaneously radiate photons can be found in the prior art and will not be repeated here.

[0027] In some embodiments, a laser window may be provided on the laser window 22 , and a photon window may be provided on the photon window 21 .

[0028] In some embodiments, reference Figure 2-3 A planar driving mechanism 5 is installed between the mounting platform 1 and the ion trap packaging module 2, and the planar driving mechanism 5 is used to drive the ion trap packaging module 2 to move on a plane parallel to the surface of the mounting platform 1. Through such an arrangement, the position of the ion trap packaging module 2 can be adjusted so that its photon window 21 is aligned with the objective lens 4, so that the objective lens 4 is always within the optimal observation range, thereby improving the photon collection efficiency.

[0029] In some embodiments, a linear drive mechanism 6 is installed between the bracket 3 and the objective lens 4, and the linear drive mechanism 6 is used to drive the objective lens 4 to move closer to or away from the mounting table 1 in a direction perpendicular to the surface of the mounting table 1. Through such an arrangement, the working distance of the objective lens 4 can be shortened to the greatest extent, thereby further improving the photon collection efficiency.

[0030] In some embodiments, the lower end of the bracket 3 is fixed on the mounting platform 1, and the upper end of the bracket 3 is connected to the linear drive mechanism 6, and the linear drive mechanism 6 is connected to the objective lens positioning ring 7, and the linear drive mechanism 6 is used to drive the objective lens positioning ring 7 to approach or move away from the mounting platform 1 in a direction perpendicular to the surface of the mounting platform 1, and the objective lens 4 is installed in the objective lens positioning ring 7. That is, in the present invention, the objective lens 4 is connected through the objective lens positioning ring 7, and the objective lens positioning ring 7 can protect the objective lens 4 to a certain extent and extend the service life of the objective lens 4.

[0031] In some embodiments, the planar drive mechanism 5 and the linear drive mechanism 6 are both piezoelectric displacement stages, specifically, piezoelectric displacement stages compatible with ultra-low temperature vacuum, which can adjust the displacement by changing the input voltage, so as to adjust and control the ion trap packaging module 2 outside the ultra-low temperature vacuum chamber so that the photon window 21 is aligned with the objective lens 4.

[0032] In some embodiments, a resonator 8 and a DC filter 9 are also provided on the mounting platform 1, and the resonator 8 and the DC filter 9 are respectively connected to the ion trap packaging module 2 signal. Specifically, the ion trap packaging module 2 has a DC interface and a radio frequency interface. The resonator 8 converts the radio frequency signal introduced from the ultra-low temperature vacuum cavity into a high-voltage, narrow-bandpass radio frequency signal, and matches the impedance at the same time to reduce the reflection of radio frequency energy. The input end of the resonator 8 is connected to a coaxial cable, and is connected to the radio frequency signal source outside the ultra-low temperature vacuum cavity through a vacuum feed-through device. The output end is connected to a coaxial cable and is connected to the radio frequency interface of the ion trap packaging module 2. The DC filter 9 is used to perform multi-stage filtering on the DC signal introduced from the ultra-low temperature vacuum cavity to remove the harmonic noise therein. The DC filter 9 includes two DC filter boards and two ceramic mounting bases. The DC filter board uses an ultra-low temperature compatible ceramic material as a substrate. A multi-stage RC filter circuit is provided on the DC filter board. The output end of the DC filter board is connected to the DC interface of the ion trap packaging module 2 through a wiring terminal.

[0033] In some embodiments, reference Figure 2 The mounting platform 1 includes a first mounting plate 11 and a second mounting plate 12 which are arranged at intervals, and two first supporting plates 13 and a second supporting plate 14 which are arranged oppositely and connect the first mounting plate 11 and the second mounting plate 12; the ion trap encapsulation module 2, the bracket 3 and the DC filter 9 are all arranged on the top surface of the first mounting plate 11, the resonator 8 is installed on the top surface of the second mounting plate 12, the outer sides of the first supporting plate 13 and the second supporting plate 14 are both provided with winding posts 15, and the bottom surface of the second mounting plate 12 is connected with a first cold head 16, which is used to connect to a cold source, and the first cold head 16 is a 4K cold head. Specifically, the mounting platform 1 is made of metal with high thermal conductivity; the diameter of the winding post 15 on the first supporting plate 13 is larger than the diameter of the winding post 15 on the second supporting plate 14. The wire post is used for heat sinking of cables and wires, reducing the influence of heat transferred to the ultra-low temperature area through the wires and cables on the ion trap encapsulation module 2, and the winding post 15 can also merge and sort the cables and wires. The thicker winding post 15 is used for heat sinking the coaxial cable with a larger bending radius, and the thinner winding post 15 is used for heat sinking the power line of the piezoelectric displacement stage and the power line of the DC filter 9 .

[0034] In some embodiments, reference Figure 1The integrated ion trap system also includes a blackbody radiation shielding shell 100. The mounting platform 1, the ion trap packaging module 2, the bracket 3 and the objective lens 4 are all located in the blackbody radiation shielding shell 100. The blackbody radiation shielding shell 100 is in the shape of a cylinder with one end closed. An optical window 101 corresponding to the laser window 22 is arranged on the side of the blackbody radiation shielding shell 100. An objective lens window 102 opposite to the photon window 21 is arranged at the closed end of the blackbody radiation shielding shell 100. The blackbody radiation shielding shell 100 provides blackbody radiation shielding for the ion trap packaging module 2 to reduce radiation heat leakage. The optical window 101 is used for the injection of laser light, and the objective lens window 102 is used for the emission of photons.

[0035] In some embodiments, continue to refer to Figure 1 , the non-closed end of the blackbody radiation shielding shell 100 is connected to a base 110, and a wire outlet 111 is provided on the base 110. The end of the base 110 away from the blackbody radiation shielding shell 100 is connected to a second cold head 120, and the second cold head 120 is used to connect to a cold source. Specifically, the base 110 is a metal cylinder with mounting flanges at both ends, and the second cold head 120 is a 50K cold head. The wire outlet 111 is used to lead out the cables and power cords inside the blackbody radiation shielding shell 100. The cables and power cords will be wound around the base 110 for several turns before being connected to the electrical feedthrough of the ultra-low temperature vacuum chamber. In this way, the heat transferred to the ultra-low temperature vacuum chamber through the cables and power cords will first be absorbed by the 50K cold head for the most part, so as to check the influence of the heating of the wire on the ultra-low temperature vacuum chamber.

[0036] The above are only embodiments of the present invention, and are not intended to limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made using the contents of the present invention specification and drawings, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. An integrated ion trap system, characterized in that: include: An installation platform (1), wherein an ion trap packaging module (2) and a bracket (3) are arranged on the installation platform (1), and an objective lens (4) is arranged on the bracket (3); a photon window (21) is arranged on the surface of the ion trap packaging module (2), and the objective lens (4) is opposite to the photon window (21). Wherein, a resonator (8) and a DC filter (9) are also arranged on the mounting platform (1), and the resonator (8) and the DC filter (9) are respectively connected to the ion trap packaging module (2) for signal connection; The mounting platform (1) comprises a first mounting plate (11), a second mounting plate (12) arranged at intervals, and two first support plates (13) and a second support plate (14) arranged opposite to each other and connecting the first mounting plate (11) and the second mounting plate (12); the ion trap packaging module (2), the bracket (3) and the DC filter (9) are all arranged on the top surface of the first mounting plate (11); the resonator (8) is mounted on the top surface of the second mounting plate (12); winding poles (15) are arranged on the outer sides of the first support plate (13) and the second support plate (14); the bottom surface of the second mounting plate (12) is connected to a first cold head (16); the first cold head (16) is used to be connected to a cold source; The ion trap packaging module (2) comprises a shell, the shell is cylindrical, an upper cover plate and a mounting plate are respectively mounted on both ends of the shell, a plurality of laser windows (22) are arranged on the surface of the shell, the photon window (21) is arranged on the upper cover plate, and the mounting plate is connected to the mounting platform (1). The integrated ion trap system further comprises a blackbody radiation shielding shell (100), wherein the mounting platform (1), the ion trap packaging module (2), the bracket (3) and the objective lens (4) are all located in the blackbody radiation shielding shell (100), the blackbody radiation shielding shell (100) is in the shape of a cylinder with one end closed, an optical window (101) corresponding to the laser window (22) is arranged on the side of the blackbody radiation shielding shell (100), and an objective lens window (102) opposite to the photon window (21) is arranged at the closed end of the blackbody radiation shielding shell (100), The non-enclosed end of the blackbody radiation shielding shell (100) is connected to a base (110), a wire outlet (111) is provided on the base (110), and one end of the base (110) away from the blackbody radiation shielding shell (100) is connected to a second cold head (120), and the second cold head (120) is used to be connected to a cold source.

2. The integrated ion trap system according to claim 1, characterized in that: A planar driving mechanism (5) is installed between the mounting platform (1) and the ion trap packaging module (2), and the planar driving mechanism (5) is used to drive the ion trap packaging module (2) to move on a plane parallel to the surface of the mounting platform (1).

3. The integrated ion trap system according to claim 2, characterized in that: A linear drive mechanism (6) is installed between the bracket (3) and the objective lens (4), and the linear drive mechanism (6) is used to drive the objective lens (4) to move closer to or farther away from the mounting platform (1) in a direction perpendicular to the surface of the mounting platform (1).

4. The integrated ion trap system according to claim 3, characterized in that: The lower end of the bracket (3) is fixed on the mounting platform (1), and the upper end of the bracket (3) is connected to the linear drive mechanism (6). The linear drive mechanism (6) is connected to an objective lens positioning ring (7). The linear drive mechanism (6) is used to drive the objective lens positioning ring (7) to move closer to or farther away from the mounting platform (1) in a direction perpendicular to the surface of the mounting platform (1). The objective lens (4) is mounted in the objective lens positioning ring (7).

5. The integrated ion trap system according to claim 3, characterized in that: The planar drive mechanism (5) and the linear drive mechanism (6) are both piezoelectric displacement stages.

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