Ion Cooling System, Method, Device, Equipment, Storage Medium and Program Product

Abstract

This application relates to an ion cooling system, method, apparatus, computer device, computer-readable storage medium, and computer program product. The system includes: a first acousto-optic modulator (AOM), an AOM group, and a propagation medium. The first AOM modulator modulates a target laser to produce linearly polarized laser light and a first laser light; the AOM group processes the first laser light to produce circularly polarized laser light; and the propagation medium injects the linearly polarized laser light and the circularly polarized laser light into an ion trap to cool the ions in the trap. This method can improve the accuracy of an ion microwave frequency standard.

Description

Technical Field

[0001] The present application relates to the technical field of ion traps, and in particular to an ion cooling system, method, apparatus, computer equipment, computer-readable storage medium, and computer program product. Background Art

[0002] Ion traps use electromagnetic fields to confine ions within a limited space, isolating them from external fields. They are widely used in a variety of fields, such as atomic clocks and quantum computing. To improve the performance of ion traps, laser cooling is required to reduce the thermal motion of the ions.

[0003] Taking the ytterbium ions in the ion trap as an example, in the related technology, when the ytterbium ions in the ion trap are laser cooled, a linearly polarized laser and an external strong magnetic field are used to destroy the dark state of the ytterbium ions in the ion trap during the laser cooling process, thereby improving the cooling efficiency of the ions in the ion trap.

[0004] However, there are large magnetic field fluctuations in the ion trap in the related art, which will cause a large second-order Zeeman frequency shift, resulting in low accuracy of the ytterbium ion microwave frequency standard. Summary of the Invention

[0005] Based on this, it is necessary to provide an ion cooling system, method and device that can improve the accuracy of ion microwave frequency standards in response to the above technical problems.

[0006] In a first aspect, the present application provides an ion cooling system, the system comprising: a first acousto-optic modulator, an acousto-optic modulator group, and a propagation medium;

[0007] a first acousto-optic modulator, for modulating the target laser to obtain a linearly polarized laser and a first laser;

[0008] an acousto-optic modulator group, used for processing the first laser to obtain circularly polarized laser;

[0009] The propagation medium is used to inject linearly polarized laser light and circularly polarized laser light into the ion trap to cool the ions in the ion trap.

[0010] In one embodiment, the acousto-optic modulator group includes: a second acousto-optic modulator, a third acousto-optic modulator, and a laser polarization state conversion module;

[0011] a second acousto-optic modulator, configured to modulate the first laser to obtain a second laser and the first diffracted light;

[0012] a third acousto-optic modulator, configured to modulate the second laser to obtain a second diffracted light;

[0013] The laser polarization state conversion module is used to convert the first diffracted light and the second diffracted light into circularly polarized laser light.

[0014] In one embodiment, the circularly polarized laser includes a left-handed circularly polarized laser and a right-handed circularly polarized laser; the laser polarization state conversion module includes: a beam combiner and a quarter wave plate;

[0015] a beam combiner, configured to combine the first diffracted light and the second diffracted light;

[0016] The quarter-wave plate is used to process the combined light obtained by the beam combiner to obtain left-handed circularly polarized laser light and right-handed circularly polarized laser light.

[0017] In one embodiment, the circularly polarized laser light includes left-handed circularly polarized laser light and right-handed circularly polarized laser light;

[0018] The propagation medium is also used to radially inject the linearly polarized laser into the ion trap through the polarization-maintaining optical fiber, so that the linearly polarized laser is polarized along the quantized axis of the electromagnetic field in the ion trap; and

[0019] The left-handed circularly polarized laser light and the right-handed circularly polarized laser light are axially injected into the ion trap through free space, so that the left-handed circularly polarized laser light and the right-handed circularly polarized laser light propagate along the direction of the quantization axis.

[0020] In one embodiment, the frequency of the left-handed circularly polarized laser is the sum of the resonance frequency of the ions in the ion trap and a preset frequency; the frequency of the right-handed circularly polarized laser is the difference between the resonance frequency and the preset frequency; and the preset frequency is one-sixth of the natural line width of the ions in the ion trap.

[0021] In one embodiment, the frequency of the linearly polarized laser light is the same as the resonance frequency of the ions in the ion trap.

[0022] In a second aspect, the present application also provides an ion cooling method, the method comprising:

[0023] Using a first acousto-optic modulator to modulate the target laser to obtain a linearly polarized laser and a first laser;

[0024] Obtaining circularly polarized laser light according to the acousto-optic modulator group and the first laser light;

[0025] Linearly polarized laser light and circularly polarized laser light are injected into the ion trap to cool the ions in the ion trap.

[0026] In one embodiment, the AOM group includes a second AOM and a third AOM; obtaining circularly polarized laser light according to the AOM group and the first laser light includes:

[0027] Modulating the first laser light using a second acousto-optic modulator to obtain a second laser light and a first diffracted light;

[0028] modulating the second laser light using a third acousto-optic modulator to obtain a second diffracted light;

[0029] Based on the first diffracted light and the second diffracted light, circularly polarized laser light is generated.

[0030] In one embodiment, the circularly polarized laser light includes left-handed circularly polarized laser light and right-handed circularly polarized laser light; and generating the circularly polarized laser light based on the first diffracted light and the second diffracted light includes:

[0031] performing beam combining processing on the first diffracted light and the second diffracted light;

[0032] The combined light obtained by the beam combining process passes through a quarter wave plate to obtain left-handed circularly polarized laser light and right-handed circularly polarized laser light.

[0033] In one embodiment, the circularly polarized laser light includes left-handed circularly polarized laser light and right-handed circularly polarized laser light; and injecting the linearly polarized laser light and the circularly polarized laser light into the ion trap comprises:

[0034] Injecting linearly polarized laser light radially into the ion trap so that the linearly polarized laser light is polarized along the quantized axis of the electromagnetic field in the ion trap;

[0035] The left-handed circularly polarized laser light and the right-handed circularly polarized laser light are axially injected into the ion trap, so that the left-handed circularly polarized laser light and the right-handed circularly polarized laser light propagate along the direction of the quantization axis.

[0036] In a third aspect, the present application further provides an ion cooling device, comprising:

[0037] A first modulation module is used to modulate the target laser using a first acousto-optic modulator to obtain a linearly polarized laser and a first laser;

[0038] a second modulation module, configured to obtain circularly polarized laser light according to the acousto-optic modulator group and the first laser light;

[0039] The laser cooling module is used to inject linearly polarized laser and circularly polarized laser into the ion trap to cool the ions in the ion trap.

[0040] In a fourth aspect, the present application further provides a computer device comprising a memory and a processor, wherein the memory stores a computer program, and the processor implements the method steps in any embodiment of the second aspect when executing the computer program.

[0041] In a fifth aspect, the present application further provides a computer-readable storage medium on which a computer program is stored. When the computer program is executed by a processor, the method steps in any embodiment of the second aspect are implemented.

[0042] In a sixth aspect, the present application further provides a computer program product, comprising a computer program, which, when executed by a processor, implements the method steps in any one of the embodiments of the second aspect above.

[0043] In the aforementioned ion cooling system, method, apparatus, computer device, computer-readable storage medium, and computer program product, the ion cooling system includes: a first acousto-optic modulator (AOM), an AOM group, and a propagation medium. The first AOM is used to modulate the target laser to produce linearly polarized laser light and a first laser light; the AOM group is used to process the first laser light to produce circularly polarized laser light; and the propagation medium is used to inject the linearly polarized laser light and the circularly polarized laser light into the ion trap to cool the ions in the ion trap. In this system, the AOM generates linearly polarized laser light and circularly polarized light of different frequencies and polarizations, which act together on the ions in the ion trap, efficiently destroying the dark state of the ions' magnetic sub-energy levels and achieving efficient laser cooling of the ions without an external strong magnetic field. Furthermore, the system does not require an external strong magnetic field, which can reduce the magnetic field strength and fluctuations within the ion trap, reduce the uncertainty of the system's second-order Zeeman frequency shift, and improve the accuracy performance of the ion microwave frequency standard. BRIEF DESCRIPTION OF THE DRAWINGS

[0044] In order to more clearly illustrate the technical solutions in the embodiments of the present application or related technologies, the following briefly introduces the drawings required for use in the embodiments of the present application or related technical descriptions. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying any creative work.

[0045] Figure 1 is a schematic structural diagram of an ion cooling system in one embodiment;

[0046] Figure 2 A schematic structural diagram of an ion cooling system in another embodiment;

[0047] Figure 3 A schematic structural diagram of an ion cooling system in another embodiment;

[0048] Figure 4 A schematic diagram of the optical path of an ion cooling system in one embodiment;

[0049] Figure 5 Schematic diagram of the process of an ion cooling method in one embodiment;

[0050] Figure 6 Schematic diagram of a process for generating circularly polarized laser light in one embodiment;

[0051] Figure 7is a schematic flow chart of a circularly polarized laser generating step in another embodiment;

[0052] Figure 8 is a structural block diagram of an ion cooling device in one embodiment;

[0053] Figure 9 FIG. 1 is a diagram showing the internal structure of a computer device in one embodiment. DETAILED DESCRIPTION

[0054] In order to make the purpose, technical solutions and advantages of this application more clear, the following further describes this application in detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain this application and are not intended to limit this application.

[0055] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art to which this application belongs; the terms used herein are for the purpose of describing specific embodiments only and are not intended to limit this application; the terms "including" and any variations thereof in the specification and claims of this application and the above-mentioned illustrations are intended to cover non-exclusive inclusions. In the description of the embodiments of this application, the technical terms "first", "second", "third", "fourth", etc. are only used to distinguish different objects and cannot be understood as indicating or implying relative importance or implicitly indicating the number, specific order or primary and secondary relationship of the indicated technical features. In the description of the embodiments of this application, the meaning of "multiple" is more than two, unless otherwise clearly and specifically defined.

[0056] References herein to "embodiments" mean that a particular feature, structure, or characteristic described in connection with the embodiments may be included in at least one embodiment of the present application. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor does it constitute an independent or alternative embodiment that is mutually exclusive of other embodiments. It is understood, both explicitly and implicitly, by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0057] In the description of the embodiments of this application, unless otherwise specified or limited, technical terms such as "connection" should be understood in a broad sense. For example, it can refer to direct connection or indirect connection through an intermediate medium, internal communication between two components, or interaction between two components. Those skilled in the art will understand the specific meanings of the above terms in the embodiments of this application based on specific circumstances.

[0058] Ion traps can confine ions, isolating them from external fields. Consequently, they are used in atomic clocks, quantum computing, quantum simulation, and other fields. For example, atomic clocks based on trapped ions, as a high-precision time and frequency standard, can be applied to positioning and navigation, wireless communications, and the exploration of new physics. Laser-cooled ion microwave clocks have become candidates for the next generation of practical microwave frequency standards due to their unique advantages, including strong anti-interference capabilities, deeper ion trap potential depths, simple physical structures, and the absence of long-term linear drift.

[0059] When using ion traps for applications such as frequency standards and quantum computing, laser cooling of trapped ions is necessary to improve performance, reduce system induction, and extend ion lifetime. This reduces the amplitude of their thermal motion. Typically, laser cooling can cool ions to millikelvin levels or even lower.

[0060] In research fields such as ion trap atomic clocks and quantum computing, a variety of different types of ions can be used.

[0061] With Ytterbium-171 ions ( 171 Yb + ) as an example, under the action of an external magnetic field, the hyperfine structure of Ytterbium-171 ions can be further subdivided into different magnon energy levels. The frequency difference of magnon energy level splitting is positively correlated with the strength of the external magnetic field. However, for ions at different magnon energy levels, the polarization requirements of the laser are different when stimulating their transitions. If only linearly polarized light is used for laser cooling, the ions are pumped to The two energy levels cannot continue to participate in the cyclic transition, and the ions are considered to be in a "dark state". At this time, the cooling efficiency of the ions will be greatly reduced.

[0062] To destroy the dark state that occurs during laser cooling, the current solution involves applying a linearly polarized laser to an external strong magnetic field. Theoretical calculations show that dark state removal is most efficient when the laser's linear polarization and the applied magnetic field form an angle of approximately 55° within the same plane. In this case, the applied magnetic field should be greater than 700µT, several dozen times the strength of the Earth's magnetic field.

[0063] However, while the prior art approach of using linearly polarized light and a strong magnetic field can disrupt the dark state of ions and achieve highly efficient laser cooling, the applied magnetic field strength is approximately 700µT, dozens of times stronger than the Earth's magnetic field. Therefore, while this prior art offers advantages such as simplicity and ease of fabrication and assembly, it also suffers from the significant disadvantage of requiring a strong magnetic field.

[0064] In some applications, strong magnetic fields can introduce serious adverse effects. For example, in atomic clock research, the strong magnetic field coils wrapped in a magnetic shielding barrel will cause certain magnetic field fluctuations in the ion trap vacuum chamber, resulting in large second-order Zeeman frequency shift uncertainties. This second-order Zeeman frequency shift is currently the main factor limiting the accuracy of ytterbium ion microwave frequency standards. Therefore, the ion cooling schemes used in related technologies are not suitable for the development of ion microwave frequency standards.

[0065] Based on this, the present application provides an ion cooling system that uses an acousto-optic modulator to frequency modulate multiple beams of linearly polarized light without introducing a strong magnetic field, generating multiple beams of modulated light (linearly polarized light and circularly polarized light) to destroy the dark state of the magnetic energy levels of ions in the ion trap, thereby improving the cooling efficiency of the ions and reducing the second-order Zeeman frequency shift uncertainty of the system.

[0066] It should be noted that the ions in the ion trap in the embodiment of the present application may be ytterbium 171 ions, or other ions, such as mercury ions, etc. This embodiment of the present application does not limit this.

[0067] The ion cooling system provided by the present application is described below through specific embodiments.

[0068] See Figure 1 , Figure 1 A schematic diagram of an ion cooling system provided in an embodiment of the present application includes: a first acousto-optic modulator (AOM), an AOM group, and a propagation medium. The first AOM is used to modulate a target laser to produce linearly polarized laser light and a first laser light; the AOM group is used to process the first laser light to produce circularly polarized laser light; and the propagation medium is used to inject the linearly polarized laser light and the circularly polarized laser light into an ion trap to cool the ions in the ion trap.

[0069] Among them, the acousto-optic modulator (AOM) changes the parameters of the input laser by applying an external changing signal, thereby achieving laser beam modulation and laser power control.

[0070] In the ion cooling system, the first AOM and the AOM group are connected in series. The first AOM inputs the target laser and outputs linearly polarized laser light and the first laser light. The AOM group inputs the first laser light output by the first AOM and outputs circularly polarized laser light. In linearly polarized laser light, the light vector vibrates in a fixed direction, while in circularly polarized laser light, both the electric and magnetic fields of the light wave rotate around themselves, resulting in a circularly polarized light wave.

[0071] The acousto-optic modulator group includes a laser polarization state conversion module and multiple acousto-optic modulators. The acousto-optic modulator modulates the input laser to output linearly polarized laser light. The laser polarization state conversion module converts the linearly polarized laser light output by each acousto-optic modulator in the acousto-optic modulator group to obtain circularly polarized laser light.

[0072] Optionally, the laser polarization state conversion module is used to generate circularly polarized laser light when linearly polarized laser light passes through a specific wave plate during propagation, and the polarization direction of the linearly polarized laser light has an angle with the optical axis plane direction of the wave plate.

[0073] In the ion cooling system provided by the embodiment of the present application, a propagation medium is used to inject laser light into the ion trap. The propagation medium is free space or a combination of polarization-maintaining fiber and free space.

[0074] For example, a polarization-maintaining fiber can be used to propagate a linearly polarized laser to fix the polarization direction of the linearly polarized laser and propagate a circularly polarized laser through free space.

[0075] For example, both the linearly polarized laser and the circularly polarized laser propagate through free space, so that the linearly polarized laser and the circularly polarized laser are eventually fed into the ion trap to achieve cooling of the ions in the ion trap.

[0076] The ion cooling system provided in the embodiment of the present application includes a first acousto-optic modulator, an acousto-optic modulator group and a propagation medium. Among them, the first acousto-optic modulator is used to modulate the target laser to obtain a linearly polarized laser and a first laser; the acousto-optic modulator group is used to process the first laser to obtain a circularly polarized laser; the propagation medium is used to inject the linearly polarized laser and the circularly polarized laser into the ion trap to cool the ions in the ion trap. In this system, linearly polarized lasers and circularly polarized light with different frequencies and polarizations are generated by the acousto-optic modulator, which act together on the ions in the ion trap, efficiently destroying the dark state of the ion's magnetic sub-energy level, and realizing efficient laser cooling of the ions without an external strong magnetic field. In addition, the system does not require an external strong magnetic field, can reduce the magnetic field strength and magnetic field fluctuations inside the ion trap, reduce the second-order Zeeman frequency shift uncertainty of the system, and improve the accuracy performance index of the ion microwave frequency standard.

[0077] The aforementioned embodiments define the functions of the first AOM, the AOM group, and the polarization-maintaining fiber in the ion cooling system. The specific implementation processes of the AOM group and the polarization-maintaining fiber are further described below.

[0078] See Figure 2 , Figure 2 Schematic diagram of the structure of a laser cooling system in another embodiment. Figure 2The AOM assembly shown includes a second AOM, a third AOM, and a laser polarization state conversion module. The second AOM is used to modulate the first laser to produce a second laser and a first diffracted light; the third AOM is used to modulate the second laser to produce a second diffracted light; and the laser polarization state conversion module is used to convert the first and second diffracted lights into circularly polarized laser light.

[0079] Figure 2 In the AOM system, the second and third AOMs of the AOM group are connected in series, and the second AOM is connected in series with the first AOM of the ion cooling system. In other words, the first, second, and third AOMs are connected in series. Furthermore, the input of the AOM group is the first laser, which is incident on the second AOM. The output is the circularly polarized laser light converted by the laser polarization state conversion module.

[0080] Figure 2 In the embodiment, the first laser output by the first AOM is the input of the second AOM, the output of the second AOM is the second laser and the first diffracted light, and the second laser is the input of the third AOM, the output of the third AOM is the second diffracted light.

[0081] Please continue to see Figure 2 The laser polarization state conversion module is connected to the second acousto-optic modulator and the third acousto-optic modulator of the acousto-optic modulator group respectively, and the input of the acousto-optic modulator group is the first diffracted light output by the second acousto-optic modulator and the second diffracted light output by the third acousto-optic modulator, and the output is circularly polarized laser.

[0082] Optionally, the laser polarization state conversion module may be a quarter wave plate to rotate the vibration directions of the first diffracted light and the second diffracted light by 90° to obtain circularly polarized laser light.

[0083] In the embodiment of the present application, a linearly polarized laser is obtained by a first acousto-optic modulator, and a circularly polarized laser is obtained by combining a second acousto-optic modulator, a third acousto-optic modulator and a laser polarization state conversion module for modulation, thereby realizing laser cooling of ions without introducing an external magnetic field, avoiding large magnetic field fluctuations in the ion trap, reducing the second-order Zeeman shift uncertainty of the ion cooling system, and improving the frequency accuracy performance of the ytterbium ion microwave frequency standard.

[0084] Next, the structure and function of the laser polarization state conversion module in the acousto-optic modulator group in the aforementioned embodiment will be further described.

[0085] See Figure 3 , Figure 3 FIG. 4 is a schematic structural diagram of an ion cooling system in one embodiment. Figure 3In the ion cooling system shown, the circularly polarized lasers include left-handed circularly polarized lasers and right-handed circularly polarized lasers, and the laser polarization state conversion module includes a beam combiner and a quarter-wave plate. The beam combiner is used to combine the first diffracted light and the second diffracted light, and the quarter-wave plate is used to process the combined light beam obtained by the beam combiner to produce left-handed circularly polarized lasers and right-handed circularly polarized lasers.

[0086] The first diffracted light and the second diffracted light are combined by a beam combiner, and then pass through a quarter-wave plate to form left-handed circularly polarized laser and right-handed circularly polarized laser, respectively, thereby improving the utilization rate of laser power.

[0087] In an embodiment of the present application, the multiple diffracted light beams generated by the acousto-optic modulator group are converted through a beam combiner and a quarter-wave plate to obtain left-handed circularly polarized laser light and right-handed circularly polarized laser light, thereby further improving the laser cooling efficiency of ions in the ion trap.

[0088] Based on obtaining linearly polarized laser light, left-handed circularly polarized laser light, and right-handed circularly polarized laser light, the method of feeding the above laser light into the ion trap is described.

[0089] In an exemplary embodiment, please see Figure 3 , circularly polarized laser includes left-handed circularly polarized laser and right-handed circularly polarized laser; the propagation medium is also used to radially inject linearly polarized laser into the ion trap through polarization-maintaining optical fiber, so that the linearly polarized laser is polarized along the quantized axis direction of the electromagnetic field in the ion trap; the left-handed circularly polarized laser and the right-handed circularly polarized laser are axially injected into the ion trap through free space, so that the left-handed circularly polarized laser and the right-handed circularly polarized laser are propagated along the quantized axis direction.

[0090] The direction of the quantization axis is the electric field direction of the electromagnetic field used to confine ions in the ion trap.

[0091] In an embodiment of the present application, the linearly polarized laser light generated by the first acousto-optic modulator is radially injected into the ion trap through a polarization-maintaining fiber, polarized along the quantization axis. Furthermore, the left-handed circularly polarized laser light and the right-handed circularly polarized laser light generated by the acousto-optic modulator group are axially injected into the ion trap through free space, so that the left-handed circularly polarized laser light and the right-handed circularly polarized laser light propagate along the quantization axis. In this way, the linearly polarized laser light, the left-handed circularly polarized laser light, and the right-handed circularly polarized laser light can all act together on the ions in the ion trap, efficiently destroying the dark state of the ions' magnetic sub-energy levels and achieving laser cooling of the ions without an external strong magnetic field.

[0092] It should be noted that, in order to achieve the highest efficiency in removing the dark state of the magnon energy level, the frequency of each beam of modulated light injected into the ion trap may be further set.

[0093] In an exemplary embodiment, the frequency of the left-handed circularly polarized laser is the sum of the resonance frequency of the ions in the ion trap and a preset frequency; the frequency of the right-handed circularly polarized laser is the difference between the resonance frequency and the preset frequency; the preset frequency is one-sixth of the natural line width of the ions in the ion trap.

[0094] In one exemplary embodiment, the frequency of the linearly polarized laser light is the same as the resonant frequency of the ions in the ion trap.

[0095] Taking the ion in the ion trap as ytterbium 171 ion as an example, the frequency of the linearly polarized laser should be set to the resonance frequency of the ytterbium ion, and the frequency of the left-handed circularly polarized laser is red-shifted by Γ / 6 relative to the resonance frequency of the ytterbium ion, where Γ is 171 Yb + The natural line width is 19.6MHz; the frequency of the right-handed circularly polarized laser is blue-shifted by Γ / 6 relative to the resonance frequency of the ytterbium ion, Γ is 171 Yb + The natural linewidth is 19.6MHz.

[0096] In a specific embodiment, taking the ions in the ion trap as ytterbium-171 ions as an example, Figure 4 is a schematic diagram of the optical path of the ion cooling system, as shown in Figure 4 As shown in the figure, the system uses three beams of modulated light generated by three acousto-optic modulators to efficiently laser cool Ytterbium-171 ions.

[0097] Figure 4 In this example, a 369nm target laser passes through the first AOM to generate a linearly polarized laser and a first laser. The linearly polarized laser is radially injected into the ion trap through a polarization-maintaining fiber, polarized along the quantization axis. The first laser passes through the second AOM to generate a first diffracted beam and a second laser. The second laser continues through the third AOM, generating a second diffracted beam. The first and second diffracted beams are combined by a polarization beam combiner (PBC) and then passed through a quarter-wave plate to form left-handed circularly polarized laser and right-handed circularly polarized laser, respectively. These beams are then injected axially into the ion trap, propagating along the quantization axis. These three modulated beams (linearly polarized laser, left-handed circularly polarized laser, and right-handed circularly polarized laser) act together on the ions in the ion trap, efficiently destroying the dark state of the ions' magnetic sub-energy levels and achieving laser cooling of the ions without an external strong magnetic field.

[0098] Moreover, in the above optical diagram, the frequency of the linearly polarized laser is the resonance frequency of the ytterbium ion, and the frequencies of the left-handed circularly polarized laser and the right-handed circularly polarized laser should be red-shifted and blue-shifted by Γ / 6 respectively relative to the resonance frequency of the ytterbium ion, where Γ is 171 Yb + The natural linewidth is 19.6MHz.

[0099] In summary, the ion cooling system provided in the embodiments of the present application can efficiently remove the dark state of the ion magnetic sub-energy level during laser cooling without the need for an additional strong magnetic field, thus achieving laser cooling of the ions. The method of generating modulated light for ytterbium ion cooling using an AOM can reduce the uncertainty of the second-order Zeeman frequency shift, thereby improving the accuracy performance of the ytterbium ion microwave frequency standard.

[0100] The above is an explanation of the embodiments related to the ion cooling system. Based on this, the embodiments of the present application also provide an embodiment of the method including the above ion cooling.

[0101] It should be noted that the following ion cooling method can be applied to a computer device that is equipped with optical simulation software, and the ion cooling method can be performed in an optical environment created by the optical simulation software. The ion cooling process is implemented by computer program instructions, which are provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing device, so that the instructions executed by the processor of the computer or other programmable data processing device can implement the cooling method of the embodiment. Of course, these computer program instructions can also be stored in a computer-readable memory that can guide the computer or other programmable data processing device to operate in a specific manner, so that the instructions stored in the computer-readable memory produce a product including an instruction device. Alternatively, these computer program instructions can also be loaded onto a computer or other programmable data processing device, so that a series of operating steps are performed on the computer or other programmable device to generate a computer-implemented process, thereby executing the computer program instructions on the computer or other programmable device to implement the above-mentioned functions.

[0102] For example, the component library in optical simulation software includes multiple optical components, such as acousto-optic modulators, wave plates, and beam combiners, and supports adjustment of each component's parameters, such as the incident angle, laser frequency, and acousto-optic modulator parameters. In this case, by executing a computer program, optical components are sequentially pulled from the component library to build the aforementioned ion cooling system and cool the ions in the ion trap.

[0103] For example, optical simulation software has built the above-mentioned ion cooling system, which controls the opening or closing of each component by executing computer programs to achieve ion cooling.

[0104] Below, relevant embodiments of the ion cooling method are described. Since the ion cooling methods described in the following embodiments reflect the principles of constructing the ion cooling system described in the preceding embodiments, the technical effects achieved by the following ion cooling methods naturally also include those of the aforementioned ion cooling system. Therefore, for the sake of brevity and clarity, the following embodiments will not be described in detail. The implementation process and effects of each embodiment can be referred to in the description of the preceding embodiments.

[0105] In an exemplary embodiment, Figure 5 As shown, an ion cooling method is provided, comprising the following steps:

[0106] S501 , modulating a target laser using a first acousto-optic modulator to obtain a linearly polarized laser and a first laser.

[0107] The target laser is input to the first acousto-optic modulator, which modulates the target laser to generate a linearly polarized laser and a first laser. The light vector of the linearly polarized laser vibrates in a fixed direction.

[0108] S502: Obtain circularly polarized laser light according to the acousto-optic modulator group and the first laser light.

[0109] The first laser is used as the input of the acousto-optic modulator group, and the acousto-optic modulator in the acousto-optic modulator group modulates and converts the first laser to output circularly polarized laser.

[0110] For example, the acousto-optic modulator group includes a laser polarization state conversion module and multiple acousto-optic modulators. The acousto-optic modulator modulates the input laser to output linearly polarized laser light. The laser polarization state conversion module converts the linearly polarized laser light output by each acousto-optic modulator in the acousto-optic modulator group to obtain circularly polarized laser light.

[0111] S503 , injecting linearly polarized laser light and circularly polarized laser light into the ion trap to cool the ions in the ion trap.

[0112] Polarization-maintaining optical fiber can be used to propagate linearly polarized laser light to fix the polarization directions of the polarized laser light and the circularly polarized laser light. Alternatively, the linearly polarized laser light and the circularly polarized laser light can be propagated through other transmission media, such as free space media, so that the linearly polarized laser light and the circularly polarized laser light are ultimately fed into the ion trap to achieve cooling of the ions in the ion trap.

[0113] In an embodiment of the present application, a first acousto-optic modulator is used to modulate the target laser to obtain a linearly polarized laser and a first laser. Then, based on the acousto-optic modulator group and the first laser, a circularly polarized laser is obtained. Finally, the linearly polarized laser and the circularly polarized laser are injected into the ion trap to cool the ions in the ion trap. In this method, linearly polarized lasers and circularly polarized light with different frequencies and polarizations are generated by the acousto-optic modulator, which act together on the ions in the ion trap, efficiently removing the dark state of the ion's magnetic sub-energy level, and realizing efficient laser cooling of the ions without an external strong magnetic field. In addition, the system does not require an external strong magnetic field, can reduce the magnetic field strength and magnetic field fluctuations inside the ion trap, reduce the second-order Zeeman frequency shift uncertainty of the system, and improve the accuracy performance index of the ion microwave frequency standard.

[0114] Next, a possible way of obtaining circularly polarized laser light based on an acousto-optic modulator group is described.

[0115] In an exemplary embodiment, Figure 6 As shown, the acousto-optic modulator group includes a second acousto-optic modulator and a third acousto-optic modulator; obtaining circularly polarized laser light according to the acousto-optic modulator group and the first laser includes:

[0116] S601: Use a second acousto-optic modulator to modulate the first laser to obtain a second laser and a first diffracted light.

[0117] The first laser output by the first acousto-optic modulator is input to the second acousto-optic modulator, the modulation switch of the second acousto-optic modulator is started, the first laser is modulated by the second acousto-optic modulator, and the second laser and the first diffracted light are output.

[0118] The first diffracted light is used as one of the bases for generating circularly polarized laser light. The second laser light is input to the third acousto-optic modulator, which modulates the second laser light and outputs the second diffracted light.

[0119] S602: Modulate the second laser light using a third acousto-optic modulator to obtain second diffracted light.

[0120] The second acousto-optic modulator and the third acousto-optic modulator are connected in series. The first diffracted light is input to the third acousto-optic modulator, and the modulation power supply of the third acousto-optic modulator is turned on. The second laser is modulated by the third acousto-optic modulator to output the second diffracted light.

[0121] S603 : Generate circularly polarized laser light based on the first diffracted light and the second diffracted light.

[0122] Wherein, the circularly polarized laser includes left-handed circularly polarized laser and right-handed circularly polarized laser. Based on the first diffracted light and the second diffracted light, the implementation steps of generating the circularly polarized laser are as follows: Figure 7 Shown, including:

[0123] S701: Combining the first diffracted light and the second diffracted light.

[0124] The first diffracted light and the second diffracted light are input to a beam combiner, and the first diffracted light and the second diffracted light are combined by the beam combiner to obtain a combined light beam. It should be noted that the direction difference between the first diffracted light and the second diffracted light is 90°.

[0125] S702 , passing the combined light beam obtained by the beam combining process through a quarter wave plate to obtain left-handed circularly polarized laser light and right-handed circularly polarized laser light.

[0126] The combined light obtained by the beam combining process is input into a quarter wave plate to obtain left-handed circularly polarized laser light and right-handed circularly polarized laser light.

[0127] In the embodiment of the present application, a linearly polarized laser is obtained by a first acousto-optic modulator, and a circularly polarized laser is obtained by combining a second acousto-optic modulator, a third acousto-optic modulator and a laser polarization state conversion module for modulation, thereby realizing laser cooling of ions without introducing an external magnetic field, avoiding large magnetic field fluctuations in the ion trap, and reducing the second-order Zeeman shift uncertainty of the ion cooling system.

[0128] In an exemplary embodiment, the circularly polarized laser light includes a left-handed circularly polarized laser light and a right-handed circularly polarized laser light; and injecting the linearly polarized laser light and the circularly polarized laser light into the ion trap comprises:

[0129] Injecting linearly polarized laser light radially into the ion trap so that the linearly polarized laser light is polarized along the quantized axis of the electromagnetic field in the ion trap;

[0130] The left-handed circularly polarized laser light and the right-handed circularly polarized laser light are axially injected into the ion trap, so that the left-handed circularly polarized laser light and the right-handed circularly polarized laser light propagate along the direction of the quantization axis.

[0131] The direction of the quantization axis is the electric field direction of the electromagnetic field used to confine ions in the ion trap.

[0132] In this embodiment, the linearly polarized laser light generated by the first acousto-optic modulator is radially injected into the ion trap through a polarization-maintaining fiber, polarized along the quantization axis. The left-handed circularly polarized laser light and the right-handed circularly polarized laser light generated by the acousto-optic modulator group are then axially injected into the ion trap through free space, propagating along the quantization axis. In this way, the linearly polarized laser light, the left-handed circularly polarized laser light, and the right-handed circularly polarized laser light can all act together on the ions in the ion trap, efficiently removing the dark state of the ions' magnetic sub-energy levels and achieving laser cooling of the ions without an external strong magnetic field.

[0133] In order to achieve the highest efficiency in removing the dark state of the magnon energy level, the frequency of the laser incident on the ion trap is set as follows: the frequency of the linearly polarized laser is the same as the resonance frequency of the ions in the ion trap; the frequency of the left-handed circularly polarized laser is the sum of the resonance frequency of the ions in the ion trap and the preset frequency; the frequency of the right-handed circularly polarized laser is the difference between the resonance frequency and the preset frequency; the preset frequency is one-sixth of the natural line width of the ions in the ion trap.

[0134] In an embodiment of the present application, linearly polarized laser, left-handed circularly polarized laser and right-handed circularly polarized laser are radially injected into the ion trap and act together on the ions in the ion trap. Without adding an external magnetic field, the magnetic energy level of the ions is removed to achieve laser cooling of the ions.

[0135] In a specific embodiment, a laser cooling method is provided, comprising the following steps:

[0136] (1) The target laser is modulated by a first acousto-optic modulator to obtain a linearly polarized laser and a first laser.

[0137] (2) The first laser is modulated by a second acousto-optic modulator to obtain a second laser and the first diffracted light.

[0138] (3) The second laser is modulated by a third acousto-optic modulator to obtain a second diffracted light.

[0139] (4) Combining the first diffracted light and the second diffracted light.

[0140] (5) The combined light obtained by the beam combining process is passed through a quarter wave plate to obtain left-handed circularly polarized laser and right-handed circularly polarized laser.

[0141] (6) Injecting linearly polarized laser light radially into the ion trap so that the linearly polarized laser light is polarized along the quantized axis of the electromagnetic field in the ion trap; injecting left-handed circularly polarized laser light and right-handed circularly polarized laser light axially into the ion trap so that the left-handed circularly polarized laser light and right-handed circularly polarized laser light propagate along the quantized axis.

[0142] In this embodiment, three acousto-optic modulators generate linearly polarized laser light and circularly polarized light of varying frequencies and polarizations, which act together on ions in an ion trap, efficiently removing the dark state of the ions' magnetic sub-levels and achieving efficient laser cooling of the ions without an external strong magnetic field. Furthermore, this system, without requiring an external strong magnetic field, can reduce the magnetic field strength and fluctuations within the ion trap, lowering the uncertainty of the system's second-order Zeeman frequency shift and improving the accuracy performance of the ion microwave frequency standard.

[0143] It should be understood that, although the various steps in the flowcharts involved in the various embodiments described above are displayed in sequence according to the instructions of the arrows, these steps are not necessarily executed in sequence in the order indicated by the arrows. Unless otherwise specified herein, there is no strict order restriction on the execution of these steps, and these steps can be executed in other orders. Moreover, at least a portion of the steps in the flowcharts involved in the various embodiments described above can include multiple steps or multiple stages, and these steps or stages are not necessarily executed and completed at the same time, but can be executed at different times, and the execution order of these steps or stages is not necessarily to be carried out in sequence, but can be executed in turn or alternately with other steps or at least a portion of steps or stages in other steps.

[0144] Based on the same inventive concept, embodiments of the present application further provide an ion cooling device for implementing the aforementioned ion cooling method. The solution provided by this device is similar to the solution described in the aforementioned method. Therefore, the specific limitations of one or more ion cooling device embodiments provided below can be found in the above-described limitations of the ion cooling method and will not be further elaborated here.

[0145] In an exemplary embodiment, Figure 8 As shown, an ion cooling device is provided, comprising: a first modulation module 801, a second modulation module 802 and a laser cooling module 803, wherein:

[0146] A first modulation module 801 is configured to modulate the target laser using a first acousto-optic modulator to obtain a linearly polarized laser and a first laser;

[0147] A second modulation module 802 is configured to obtain circularly polarized laser light according to the acousto-optic modulator group and the first laser light;

[0148] The laser cooling module 803 is used to inject linearly polarized laser light and circularly polarized laser light into the ion trap to cool the ions in the ion trap.

[0149] In an exemplary embodiment, the second modulation module 802 includes:

[0150] a first modulation unit, configured to modulate the first laser light using a second acousto-optic modulator to obtain a second laser light and a first diffracted light;

[0151] a second modulation unit, configured to modulate the second laser light using a third acousto-optic modulator to obtain a second diffracted light;

[0152] The circularly polarized light generating unit is configured to generate circularly polarized laser light based on the first diffracted light and the second diffracted light.

[0153] In an exemplary embodiment, the circularly polarized light generating unit includes:

[0154] a beam combining subunit, configured to combine the first diffracted light and the second diffracted light;

[0155] The laser conversion subunit is used to pass the combined light obtained by the beam combining process through a quarter wave plate to obtain left-handed circularly polarized laser and right-handed circularly polarized laser.

[0156] In an exemplary embodiment, the laser cooling module 803 is used to radially inject linearly polarized laser light into the ion trap so that the linearly polarized laser light is polarized along the quantization axis of the electromagnetic field in the ion trap; and to axially inject left-handed circularly polarized laser light and right-handed circularly polarized laser light into the ion trap so that the left-handed circularly polarized laser light and right-handed circularly polarized laser light propagate along the quantization axis.

[0157] Each module in the aforementioned ion cooling device can be implemented in whole or in part through software, hardware, or a combination thereof. Each module can be embedded in or independent of a processor in a computer device in the form of hardware, or can be stored in a memory in the computer device in the form of software, so that the processor can call and execute the corresponding operations of each module.

[0158] In an exemplary embodiment, a computer device is provided. The computer device may be a terminal, and its internal structure diagram may be as shown in FIG. Figure 9As shown. The computer device includes a processor, memory, an input / output interface, a communication interface, a display unit, and an input device. The processor, memory, and input / output interface are connected via a system bus, and the communication interface, display unit, and input device are connected to the system bus via the input / output interface. The processor of the computer device is used to provide computing and control capabilities. The memory of the computer device includes a non-volatile storage medium and internal memory. The non-volatile storage medium stores an operating system and computer programs. The internal memory provides an environment for the operation of the operating system and computer programs in the non-volatile storage medium. The input / output interface of the computer device is used to exchange information between the processor and external devices. The communication interface of the computer device is used to communicate with external terminals via wired or wireless means, and the wireless means can be implemented via Wi-Fi, a mobile cellular network, near-field communication (NFC), or other technologies. When executed by the processor, the computer program implements an ion cooling method. The display unit of the computer device is used to form a visually visible image, and can be a display screen, a projection device, or a virtual reality imaging device. The display screen can be a liquid crystal display screen or an electronic ink display screen, and the input device of the computer device can be a touch layer covering the display screen, or a button, trackball or touchpad set on the computer device casing, or an external keyboard, touchpad or mouse.

[0159] Those skilled in the art will understand that Figure 9 The structure shown in the figure is only a block diagram of a part of the structure related to the solution of the present application, and does not constitute a limitation on the computer device to which the solution of the present application is applied. The specific computer device may include more or fewer components than shown in the figure, or combine certain components, or have a different component arrangement.

[0160] In an exemplary embodiment, a computer device is provided, including a memory and a processor, wherein a computer program is stored in the memory, and when the processor executes the computer program, the following steps are implemented:

[0161] Using a first acousto-optic modulator to modulate the target laser to obtain a linearly polarized laser and a first laser;

[0162] Obtaining circularly polarized laser light according to the acousto-optic modulator group and the first laser light;

[0163] Linearly polarized laser light and circularly polarized laser light are injected into the ion trap to cool the ions in the ion trap.

[0164] In an exemplary embodiment, when the processor executes the computer program, the processor further implements the following steps:

[0165] Modulating the first laser light using a second acousto-optic modulator to obtain a second laser light and a first diffracted light;

[0166] modulating the second laser light using a third acousto-optic modulator to obtain a second diffracted light;

[0167] Based on the first diffracted light and the second diffracted light, circularly polarized laser light is generated.

[0168] In an exemplary embodiment, when the processor executes the computer program, the processor further implements the following steps:

[0169] performing beam combining processing on the first diffracted light and the second diffracted light;

[0170] The combined light obtained by the beam combining process passes through a quarter wave plate to obtain left-handed circularly polarized laser light and right-handed circularly polarized laser light.

[0171] In an exemplary embodiment, when the processor executes the computer program, the processor further implements the following steps:

[0172] Injecting linearly polarized laser light radially into the ion trap so that the linearly polarized laser light is polarized along the quantized axis of the electromagnetic field in the ion trap;

[0173] The left-handed circularly polarized laser light and the right-handed circularly polarized laser light are axially injected into the ion trap, so that the left-handed circularly polarized laser light and the right-handed circularly polarized laser light propagate along the direction of the quantization axis.

[0174] In an exemplary embodiment, a computer-readable storage medium is provided, on which a computer program is stored. When the computer program is executed by a processor, the following steps are implemented:

[0175] Using a first acousto-optic modulator to modulate the target laser to obtain a linearly polarized laser and a first laser;

[0176] Obtaining circularly polarized laser light according to the acousto-optic modulator group and the first laser light;

[0177] Linearly polarized laser light and circularly polarized laser light are injected into the ion trap to cool the ions in the ion trap.

[0178] In an exemplary embodiment, when the computer program is executed by a processor, the following steps are further implemented:

[0179] Modulating the first laser light using a second acousto-optic modulator to obtain a second laser light and a first diffracted light;

[0180] modulating the second laser light using a third acousto-optic modulator to obtain a second diffracted light;

[0181] Based on the first diffracted light and the second diffracted light, circularly polarized laser light is generated.

[0182] In an exemplary embodiment, when the computer program is executed by a processor, the following steps are further implemented:

[0183] performing beam combining processing on the first diffracted light and the second diffracted light;

[0184] The combined light obtained by the beam combining process passes through a quarter wave plate to obtain left-handed circularly polarized laser light and right-handed circularly polarized laser light.

[0185] In an exemplary embodiment, when the computer program is executed by a processor, the following steps are further implemented:

[0186] Injecting linearly polarized laser light radially into the ion trap so that the linearly polarized laser light is polarized along the quantized axis of the electromagnetic field in the ion trap;

[0187] The left-handed circularly polarized laser light and the right-handed circularly polarized laser light are axially injected into the ion trap, so that the left-handed circularly polarized laser light and the right-handed circularly polarized laser light propagate along the direction of the quantization axis.

[0188] In an exemplary embodiment, a computer program product is provided, comprising a computer program, which, when executed by a processor, implements the following steps:

[0189] Using a first acousto-optic modulator to modulate the target laser to obtain a linearly polarized laser and a first laser;

[0190] Obtaining circularly polarized laser light according to the acousto-optic modulator group and the first laser light;

[0191] Linearly polarized laser light and circularly polarized laser light are injected into the ion trap to cool the ions in the ion trap.

[0192] In an exemplary embodiment, when the computer program is executed by a processor, the following steps are further implemented:

[0193] Modulating the first laser light using a second acousto-optic modulator to obtain a second laser light and a first diffracted light;

[0194] modulating the second laser light using a third acousto-optic modulator to obtain a second diffracted light;

[0195] Based on the first diffracted light and the second diffracted light, circularly polarized laser light is generated.

[0196] In an exemplary embodiment, when the computer program is executed by a processor, the following steps are further implemented:

[0197] performing beam combining processing on the first diffracted light and the second diffracted light;

[0198] The combined light obtained by the beam combining process passes through a quarter wave plate to obtain left-handed circularly polarized laser light and right-handed circularly polarized laser light.

[0199] In an exemplary embodiment, when the computer program is executed by a processor, the following steps are further implemented:

[0200] Injecting linearly polarized laser light radially into the ion trap so that the linearly polarized laser light is polarized along the quantized axis of the electromagnetic field in the ion trap;

[0201] The left-handed circularly polarized laser light and the right-handed circularly polarized laser light are axially injected into the ion trap, so that the left-handed circularly polarized laser light and the right-handed circularly polarized laser light propagate along the direction of the quantization axis.

[0202] It should be noted that the user information (including but not limited to user device information, user personal information, etc.) and data (including but not limited to data used for analysis, stored data, displayed data, etc.) involved in this application are all information and data authorized by the user or fully authorized by all parties, and the collection, use and processing of relevant data must comply with relevant regulations.

[0203] Those skilled in the art will understand that all or part of the processes in the above-mentioned embodiments can be implemented by instructing the relevant hardware through a computer program. The computer program can be stored in a non-volatile computer-readable storage medium. When the computer program is executed, it can include the processes of the embodiments of the above-mentioned methods. In particular, any reference to memory, database, or other media used in the embodiments provided in this application can include at least one of non-volatile memory and volatile memory. Non-volatile memory can include read-only memory (ROM), magnetic tape, floppy disk, flash memory, optical memory, high-density embedded non-volatile memory, resistive random access memory (ReRAM), magnetic random access memory (MRAM), ferroelectric random access memory (FRAM), phase change memory (PCM), graphene memory, etc. Volatile memory can include random access memory (RAM) or external cache memory, etc. By way of illustration and not limitation, RAM can take various forms, such as static random access memory (SRAM) or dynamic random access memory (DRAM). The databases involved in the various embodiments provided herein may include at least one of a relational database and a non-relational database. Non-relational databases may include, but are not limited to, blockchain-based distributed databases. The processors involved in the various embodiments provided herein may be, but are not limited to, general-purpose processors, central processing units (CPUs), graphics processing units (GPUs), digital signal processors (DSPs), programmable logic devices (PLDs), quantum computing-based data processing logic devices, artificial intelligence (AI) processors, and the like.

[0204] The technical features of the above embodiments can be combined arbitrarily. In order to make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this application.

[0205] The above-described embodiments merely represent several implementation methods of the present application. While the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the present application. It should be noted that a person of ordinary skill in the art may make various modifications and improvements without departing from the spirit of the present application, and these modifications and improvements fall within the scope of protection of the present application. Therefore, the scope of protection of the present application shall be determined by the appended claims.

Claims

1. An ion cooling system, characterized in that: The system includes: a first acousto-optic modulator, an acousto-optic modulator group, and a propagation medium; The first acousto-optic modulator is used to modulate the target laser to obtain a linearly polarized laser and a first laser; The acousto-optic modulator group is used to modulate the first laser to output a linearly polarized laser, and generate a circularly polarized laser through a wave plate during the propagation of the modulated linearly polarized laser; The propagation medium is used to inject the linearly polarized laser light and the circularly polarized laser light modulated by the first acousto-optic modulator into the ion trap to cool the ions in the ion trap.

2. The system according to claim 1, wherein: The acousto-optic modulator group includes: a second acousto-optic modulator, a third acousto-optic modulator and a laser polarization state conversion module; The second acousto-optic modulator is used to modulate the first laser to obtain a second laser and a first diffracted light; The third acousto-optic modulator is used to modulate the second laser to obtain second diffracted light; The laser polarization state conversion module is used to convert the first diffracted light and the second diffracted light into the circularly polarized laser.

3. The system according to claim 2, characterized in that The circularly polarized laser includes left-handed circularly polarized laser and right-handed circularly polarized laser; the laser polarization state conversion module includes: a beam combiner and a quarter wave plate; The beam combiner is used to combine the first diffracted light and the second diffracted light; The quarter-wave plate is used to process the combined light obtained by the beam combiner to obtain the left-handed circularly polarized laser and the right-handed circularly polarized laser.

4. The system according to any one of claims 1 to 3, characterized in that: The circularly polarized laser includes left-handed circularly polarized laser and right-handed circularly polarized laser; The propagation medium is further used to radially inject the linearly polarized laser into the ion trap through a polarization-maintaining optical fiber, so that the linearly polarized laser is polarized along the quantized axis of the electromagnetic field in the ion trap; as well as, The left-handed circularly polarized laser light and the right-handed circularly polarized laser light are axially injected into the ion trap through free space, so that the left-handed circularly polarized laser light and the right-handed circularly polarized laser light propagate along the direction of the quantization axis.

5. The system according to claim 4, characterized in that The frequency of the left-handed circularly polarized laser is the sum of the resonance frequency of the ions in the ion trap and a preset frequency; the frequency of the right-handed circularly polarized laser is the difference between the resonance frequency and the preset frequency; the preset frequency is one-sixth of the natural line width of the ions in the ion trap.

6. The system according to any one of claims 1 to 3, characterized in that: The frequency of the linearly polarized laser light is the same as the resonance frequency of the ions in the ion trap.

7. An ion cooling method, characterized in that: The method comprises: Using a first acousto-optic modulator to modulate the target laser to obtain a linearly polarized laser and a first laser; Modulating the first laser light according to the acousto-optic modulator group to output a linearly polarized laser light, and generating a circularly polarized laser light through a wave plate during the propagation of the modulated linearly polarized laser light; The linearly polarized laser light and the circularly polarized laser light modulated by the first acousto-optic modulator are injected into an ion trap to cool the ions in the ion trap.

8. The method according to claim 7, characterized in that The acousto-optic modulator group includes a second acousto-optic modulator and a third acousto-optic modulator; the acousto-optic modulator group modulates the first laser to output a linearly polarized laser, and generates a circularly polarized laser through a wave plate during the propagation of the modulated linearly polarized laser, including: modulating the first laser light using the second acousto-optic modulator to obtain a second laser light and a first diffracted light; modulating the second laser light using the third acousto-optic modulator to obtain second diffracted light; The circularly polarized laser light is generated based on the first diffracted light and the second diffracted light.

9. The method according to claim 8, characterized in that The circularly polarized laser light includes left-handed circularly polarized laser light and right-handed circularly polarized laser light; and generating the circularly polarized laser light based on the first diffracted light and the second diffracted light includes: performing beam combining processing on the first diffracted light and the second diffracted light; The combined light obtained by the beam combining process passes through a quarter wave plate to obtain the left-handed circularly polarized laser and the right-handed circularly polarized laser.

10. The method according to any one of claims 7 to 9, characterized in that: The circularly polarized laser includes a left-handed circularly polarized laser and a right-handed circularly polarized laser; and injecting the linearly polarized laser and the circularly polarized laser into the ion trap includes: injecting the linearly polarized laser light radially into the ion trap so that the linearly polarized laser light is polarized along the quantized axis of the electromagnetic field in the ion trap; The left-handed circularly polarized laser light and the right-handed circularly polarized laser light are axially injected into the ion trap, so that the left-handed circularly polarized laser light and the right-handed circularly polarized laser light propagate along the quantization axis direction.

11. An ion cooling device, characterized in that: The device comprises: A first modulation module is used to modulate the target laser using a first acousto-optic modulator to obtain a linearly polarized laser and a first laser; a second modulation module, configured to modulate the first laser according to the acousto-optic modulator group to output a linearly polarized laser, and generate a circularly polarized laser through a wave plate during the propagation of the modulated linearly polarized laser; The laser cooling module is used to inject the linearly polarized laser light modulated by the first acousto-optic modulator and the circularly polarized laser light into the ion trap to cool the ions in the ion trap.

12. A computer device comprising a memory and a processor, wherein the memory stores a computer program, wherein: When the processor executes the computer program, the steps of the method according to any one of claims 7 to 10 are implemented.

13. A computer-readable storage medium having a computer program stored thereon, characterized in that: When the computer program is executed by a processor, the steps of the method according to any one of claims 7 to 10 are implemented.

14. A computer program product comprising a computer program, characterized in that When the computer program is executed by a processor, the steps of the method according to any one of claims 7 to 10 are implemented.

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