Ion trap device and quantum computing equipment

Abstract

The utility model provides an ion trap device and quantum computing equipment comprising the ion trap device, and the ion trap device comprises an ion trap; the cavity is used for sealing the ion trap; the plane window is arranged on the side wall of the cavity; the spherical reflector is arranged in the cavity and is concave towards the plane window, the curvature radius of the spherical reflector is twice of the focal length of the spherical reflector, and ions trapped in the ion trap are arranged at the curvature center of the spherical reflector; the objective lens is arranged outside the cavity, a light inlet of the objective lens is aligned with the plane window, and the spherical reflector, the ion lens and the objective lens are coaxially arranged. By using the ion trap device provided by the utility model, the fluorescence collection efficiency of the ion trap can be improved without adding an objective lens, and for quantum computing equipment, more accurate, more reliable and more efficient quantum computing can be realized.

Description

Technical Field

[0001] The utility model relates to the technical field of quantum computers, in particular to an ion trap device and a quantum computing device including the ion trap device. Background Art

[0002] At present, the research and development and application of ion trap-based quantum computers are being accelerated. Such a quantum computing device mainly uses an ion trap to trap ions and manipulate their quantum states to achieve the storage and manipulation of qubits. At the same time, it also uses quantum entanglement to achieve quantum parallel computing and quantum state transmission, and reads the state of qubits by measuring the physical properties of ions, so as to complete quantum computing tasks. Since reading the state of qubits is a necessary step in the output of quantum computing, it is necessary to collect the fluorescence photons emitted by ions from the ion trap. Summary of the Invention

[0003] In order to solve the above technical problems, the purpose of the utility model is to provide an ion trap device and a quantum computing device including the ion trap device, so as to facilitate the collection of fluorescence photons emitted by ions from the ion trap.

[0004] The utility model provides an ion trap device, which includes: an ion trap; a cavity for sealing the ion trap; a planar window provided on the side wall of the cavity; a spherical mirror provided inside the cavity and concave towards the planar window, the radius of curvature of the spherical mirror being twice the focal length of the spherical mirror, and the ions trapped in the ion trap being arranged at the center of curvature of the spherical mirror; an objective lens provided outside the cavity, the light inlet of the objective lens being aligned with the planar window, wherein the spherical mirror, the ions and the objective lens are coaxially arranged.

[0005] Preferably, the ions radiate fluorescence into the surrounding space with equal probability at a solid angle of 4π.

[0006] Preferably, the focal ratio of the spherical mirror is adapted to the numerical aperture of the objective lens.

[0007] Preferably, the distance between the ions and the objective lens is the working distance of the objective lens.

[0008] Preferably, the ions are one of ytterbium ions, calcium ions and barium ions.

[0009] Preferably, the ion trap is one of a blade trap, a quadrupole trap and a needle electrode trap.

[0010] Preferably, the spherical mirror is made of one of fused quartz, sapphire, ceramic and stainless steel.

[0011] Preferably, the surface of the spherical mirror is coated with a reflective film for enhancing the reflection of fluorescence.

[0012] Preferably, the surface of the spherical mirror is coated with an indium tin oxide (ITO) film for reducing charge accumulation.

[0013] The present utility model also provides a quantum computing device, which is the ion trap device as described above.

[0014] The present utility model can at least double the fluorescence collection efficiency of the ion trap without adding an additional objective lens. For a quantum computing device, the present utility model can significantly improve the accuracy and efficiency of quantum state detection, thereby enhancing the fidelity of qubit state reading, enhancing the coherence of qubits, improving the fidelity of quantum gate operations, and accelerating its quantum computing process, etc., which will contribute to achieving more accurate, reliable, and efficient quantum computing. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Through the following description in conjunction with the drawings, the above objects and features of the present utility model will become clearer.

[0016] Figure 1 The structural schematic diagram of the ion trap device of the present utility model is shown. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0017] Hereinafter, embodiments of the present utility model will be described in detail with reference to the drawings.

[0018] Refer to Figure 1 , the ion trap device of the present utility model at least includes an ion trap (not shown in the figure), a cavity 101, a planar window 102, a spherical mirror 103, and an objective lens 104.

[0019] In Figure 1 the ion trap device shown, the cavity 101 is used to seal the ion trap; the planar window 102 is disposed on the side wall of the cavity 101; the spherical mirror 103 is disposed inside the cavity 101 and concave towards the planar window 102, the radius of curvature of the spherical mirror 103 is twice the focal length of the spherical mirror 103, and the ion 100 trapped in the ion trap is disposed at the center of curvature of the spherical mirror 103; the objective lens 104 is disposed outside the cavity 101, and the light inlet of the objective lens 104 is aligned with the planar window 102. Among them, the spherical mirror 103, the ion 100, and the objective lens 104 are coaxially disposed. The coaxial arrangement can ensure that the collected fluorescence is transmitted along the same optical axis, optimize the focusing effect of the fluorescence, reduce stray light in the optical path, improve the fluorescence collection efficiency and focusing quality, and achieve efficient photon collection.

[0020] In Figure 1In the shown ion trap device, the fluorescence emitted by the ions 100 trapped in the ion trap can be collected by the spherical mirror 103 on the left side and the planar window 102 on the right side respectively. Since the ions 100 trapped in the ion trap are arranged at the center of curvature of the spherical mirror 103, the fluorescence radiated by the ions 100 within the aperture range of the spherical mirror 103 on the left side can be reflected back to the position of the ions 100 along the original path by the spherical mirror 103, and coincides with the fluorescence radiated by the ions 100 within the aperture range of the planar window 102 on the right side, and is transmitted together through the planar window 102 on the right side to the objective lens 104 arranged outside the cavity 101 for collimation, and then transmitted to a light detection device (not shown in the figure) for detection.

[0021] Therefore, by using the ion trap device provided by the present utility model, not only can the fluorescence emitted by the ions trapped in the ion trap towards the window side be collected, but also the fluorescence emitted by the ions towards the other side opposite to the window can be collected, so that the fluorescence collection efficiency of the ion trap is increased by at least two times.

[0022] In Figure 1 In the shown ion trap device, the ion trap can be sealed in a cryogenic ultra-high vacuum environment inside the cavity. Such a vacuum environment helps to improve the performance, stability and application range of the ion trap.

[0023] In Figure 1 In the shown ion trap device, the ions 100 can radiate fluorescence into the surrounding space with equal probability at a 4π solid angle. This can ensure that the fluorescence signal can cover a very large angular range, further improving the fluorescence collection efficiency of the ion trap.

[0024] In Figure 1 In the shown ion trap device, the focal ratio of the spherical mirror 103 (i.e., the ratio of the focal length of the spherical mirror 103 to the aperture) can be adapted to the numerical aperture of the objective lens 104. This can ensure that the fluorescence emitted by the ions is effectively reflected by the spherical mirror and focused onto the collection area of the objective lens to increase the collection efficiency of the fluorescence signal.

[0025] In Figure 1 In the shown ion trap device, the distance between the ions 100 and the objective lens 104 can be set to the working distance of the objective lens 104. When the distance between the ions and the objective lens is equal to the working distance of the objective lens, the focusing effect of the objective lens reaches the best, so that the collected fluorescence can be focused onto the light detection device to the maximum extent. In this case, the fluorescence signal can be collected by the objective lens to the maximum extent to further improve the fluorescence collection efficiency of the ion trap.

[0026] In Figure 1In the illustrated ion trap device, the ion 100 can be a ytterbium ion, a calcium ion, a barium ion, or other particles suitable for being trapped in the ion trap, and the present invention is not limited thereto. The ion trap for trapping the ion 100 can be a blade trap, a quadrupole trap, a needle electrode trap, or other types of ion traps, and the present invention is not limited thereto either.

[0027] In Figure 1 In the illustrated ion trap device, the spherical mirror 103 can be made of materials such as, but not limited to, fused quartz, sapphire, ceramic, and stainless steel. These materials each have their unique advantages. Fused quartz has high transparency and good ultraviolet transmittance, sapphire has high hardness and good thermal conductivity, ceramic materials have high purity and excellent ion storage ability, and stainless steel has good stability and workability. The most suitable material can be selected according to the specific working environment requirements and conditions to prepare the spherical mirror.

[0028] In Figure 1 In the illustrated ion trap device, the surface of the spherical mirror 103 can be coated with a reflective film for enhancing the reflection of fluorescence to further improve the fluorescence collection efficiency of the ion trap. In addition, the surface of the spherical mirror 103 can also be coated with an indium tin oxide (ITO) film for reducing charge accumulation to reduce the influence of the accumulated charge on the fluorescence collection efficiency and quality. The accumulation of these charges on the surface of the spherical mirror can form an electrostatic field, and this electrostatic field can interfere with the propagation of fluorescence photons, resulting in some fluorescence photons being reflected, scattered, or absorbed, thereby reducing the fluorescence collection efficiency.

[0029] The ion trap device provided by the present utility model can be applied to a quantum computing device that realizes quantum bit storage and operation based on an ion trap to improve the fluorescence collection efficiency of the ion trap. For a quantum computing device, the improvement of the fluorescence collection efficiency means that more fluorescence photons can be collected, thereby improving the accuracy and precision of the quantum bit state reading. This is crucial for performing quantum gate operations, implementing quantum algorithms, and verifying quantum computing results. In addition, the improvement of the fluorescence collection efficiency also means that enough fluorescence photons can be collected in a shorter time to determine the state of the quantum bit. This can significantly accelerate the reading speed of the quantum bit and further improve the execution efficiency of quantum computing. Furthermore, the improvement of the fluorescence collection efficiency helps to more accurately read the state of the quantum bit, thereby reducing the decrease in the quantum bit fidelity caused by reading errors. High-fidelity quantum bits are the basis for performing high-precision quantum computing and quantum error correction.

[0030] Therefore, using the quantum computing device of the present utility model can more accurately read the state of the quantum bit, reduce errors, improve the accuracy and reliability of quantum computing, and promote the development of quantum computing applications.

[0031] Although the present application has been shown and described with reference to preferred embodiments, those skilled in the art should understand that various modifications and variations can be made to these embodiments without departing from the spirit and scope of the present application as defined by the claims.

Claims

1. An ion trap device, characterized in that: include: Ion trap; A cavity, used to seal the ion trap; A plane window is arranged on the side wall of the cavity; A spherical reflector is arranged inside the cavity and concave toward the plane window, the radius of curvature of the spherical reflector is twice the focal length of the spherical reflector, and the ions trapped in the ion trap are arranged at the center of curvature of the spherical reflector; An objective lens is arranged outside the cavity, and a light inlet of the objective lens is aligned with the plane window. Wherein, the spherical reflector, the ions and the objective lens are coaxially arranged.

2. The device according to claim 1, characterized in that The ions radiate fluorescence with equal probability into the surrounding space at a solid angle of 4π.

3. The device according to claim 1, characterized in that The focal ratio of the spherical reflector is adapted to the numerical aperture of the objective lens.

4. The device according to claim 1, characterized in that The distance between the ions and the objective lens is the working distance of the objective lens.

5. The device according to claim 1, characterized in that The ion trap is one of a blade trap, a quadrupole trap and a needle trap.

6. The device according to claim 1, characterized in that The spherical reflector is made of one of fused quartz, sapphire, ceramic and stainless steel.

7. The device according to claim 1, characterized in that The surface of the spherical reflector is coated with a reflective film for enhancing reflection of fluorescent light.

8. The device according to claim 1, characterized in that The surface of the spherical reflector is coated with a tin-doped indium oxide film for reducing charge accumulation.

9. A quantum computing device, characterized in that An ion trap device comprising any one of claims 1-8.

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