A system and method for multi-path raman optical phase locking for ion trap systems

Abstract

The application provides a multi-path Raman light phase locking system for an ion trap system, which comprises a light source unit, a light splitting path, a signal source unit, a beam combining unit and a feedback unit, wherein the light source unit is used for emitting n initial Raman lights; the signal source unit is used for emitting n initial driving signals; the light splitting path has n paths, and is used for transmitting the received n initial Raman lights to n ion manipulation modules under the driving of the n initial driving signals, and then transmitting the n initial Raman lights into an ion trap to manipulate ions; the beam combining unit is used for sampling the frequency and phase between the output lights of every two light splitting paths; and the feedback unit is used for performing phase compensation processing on the sampled signals and feeding back the phase compensation signals to the initial driving signal corresponding to one of the every two light splitting paths. The application can eliminate the phase difference between the every two light splitting paths caused by environmental disturbance.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of quantum computing, and particularly relates to a system and method for multi-path Raman light phase locking of an ion trap system. BACKGROUND

[0002] An ion trap quantum computer is one of the possible routes to realize large-scale quantum computing today. In an ion trap, double-sided Raman lasers are often used to address and operate quantum bits on ions. Two Raman lights pass through different optical paths and irradiate the ions at the same time. In order to ensure the coherence of the two lights, the phase stability between the two lights is required to be very high. However, the optical paths (including spatial optical paths or spatial optical paths) through which the two lights pass, especially the optical fiber optical path, are easily disturbed by external vibration and temperature fluctuation. These disturbances will change the phase of each light, and eventually cause a phase difference between the two lights (and the phase difference is random), which will destroy the coherence between the two lights and affect the quantum bit operation effect of the ions.

[0003] Therefore, it is necessary to design a method and system for multi-path Raman light phase locking of an ion trap system to solve the above technical problems. SUMMARY

[0004] In view of the above problems, the present application provides a method for multi-path Raman light phase locking of an ion trap system, which comprises:

[0005] A multi-path Raman light phase locking system for an ion trap system, the system comprising a light source unit, a light splitting optical path, a signal source unit, a beam combining unit and a feedback unit, wherein,

[0006] The light source unit is used to emit n initial Raman lights;

[0007] The signal source unit is used to emit n initial driving signals;

[0008] The light splitting optical path has n paths, and is used to transmit the received n initial Raman lights to n ion manipulation modules under the driving of the n initial driving signals, and then enter an ion trap for ion manipulation;

[0009] The beam combining unit is used to sample the frequency and phase between the output lights of every two light splitting optical paths;

[0010] The feedback unit is used to perform phase compensation processing on the sampled signals, and feed back the initial driving signal corresponding to each of the two light splitting optical paths to eliminate the phase difference between the two light splitting optical paths caused by environmental disturbance, and then input into the ion trap through the corresponding light splitting optical path.

[0011] Further, the light source module comprises a laser and a first light splitting module, wherein,

[0012] The laser is configured to emit initial Raman light.

[0013] The first light splitting module is configured to split the initial Raman light into n paths of initial Raman light.

[0014] Further, the light splitting path comprises a modulation module and a transmission optical path, wherein

[0015] The modulation module is configured to modulate the initial Raman light emitted by the first light splitting module in frequency and phase under the driving of the initial driving signal.

[0016] The transmission optical path is configured to transmit the light modulated by the modulation module.

[0017] Further, the light splitting path further comprises a second light splitting module, wherein

[0018] The second light splitting module is configured to split the light transmitted by the transmission optical path into two paths, one of which is used to enter the ion trap after passing through the ion manipulation module, and the other of which is transmitted to the beam combining unit.

[0019] Further, the feedback unit comprises a photodetector (PD), a first frequency mixer, a filtering module, a PID servo module, and 1 / 2n phase shifters, wherein

[0020] The photodetector (PD) is configured to beat the two paths of sampling signals sampled by the beam combining unit to obtain a beat signal, wherein the beat signal is a difference frequency signal of the two paths of signals sampled by the beam combining unit.

[0021] The first frequency mixer is configured to mix the local oscillator signal emitted by the signal source unit with the beat signal to obtain a first mixed signal for phase compensation processing.

[0022] The PID servo module is configured to feed back the first mixed signal to the initial driving signal corresponding to one of the every two paths of light splitting paths, and input to the modulation module corresponding to the initial driving signal through a phase shifter.

[0023] Further, the signal source unit comprises a signal source and 1 / 2n phase shifters, wherein

[0024] The signal source is configured to emit n paths of initial driving signals.

[0025] The signal source unit further comprises a second frequency mixer, wherein the second frequency mixer is configured to mix every two paths of initial driving signals.

[0026] Further, the signal source unit further comprises n signal branching modules, wherein

[0027] Each signal branching module is used for branching each initial driving signal into two paths, one of which enters the second mixer, and the other of which is used to enter the corresponding modulation module through a phase shifter.

[0028] In another aspect, the application also provides a method for multi-path Raman light phase locking of an ion trap system, characterized in that the method comprises:

[0029] An optical source unit is used to emit n initial Raman lights;

[0030] A signal source unit is used to emit n initial driving signals;

[0031] n optical paths are used to transmit the received n initial Raman lights to n ion manipulation modules under the driving of the n initial driving signals, and then the n initial Raman lights enter an ion trap for ion manipulation.

[0032] A beam combination unit is used to sample the frequency and phase between the output lights of every two optical paths;

[0033] A feedback unit is used to perform phase compensation processing on the sampled signals, and feed back the phase compensation processing results to the initial driving signal corresponding to one of the two optical paths, so as to eliminate the phase difference between the two optical paths caused by environmental disturbance, and then input the phase compensation processing results to the ion trap through the corresponding optical path.

[0034] Further, the optical source unit is used to emit n initial Raman lights, which comprises:

[0035] A laser in the optical source module is used to emit initial Raman light;

[0036] A first light splitting module in the optical source module is used to split the initial Raman light into n initial Raman lights.

[0037] Further, the n optical paths are used to transmit the received n initial Raman lights to n ion manipulation modules under the driving of the n initial driving signals, which comprises:

[0038] A modulation module in the optical path is used to modulate the initial Raman light emitted by the first light splitting module in frequency and phase under the driving of the initial driving signal;

[0039] A transmission optical path in the optical path is used to transmit the light modulated by the modulation module;

[0040] A second light splitting module in the optical path is used to split the light transmitted by the transmission optical path into two paths, one of which is used to enter the ion trap after passing through the ion manipulation module, and the other of which is transmitted to the beam combination unit.

[0041] Further, the feedback unit is used to perform phase compensation processing on the sampled sampling signal, and feed back to the initial driving signal corresponding to one of the every 2-way optical splitting light path, comprising:

[0042] The photodetector (PD) in the feedback unit is used to beat the 2-way sampling signal sampled by the beam combining unit to obtain a beat signal, wherein the beat signal is the difference frequency signal of the 2-way signal sampled by the beam combining unit;

[0043] The first mixer in the feedback unit is used to mix the local oscillator signal emitted by the signal source unit with the beat signal to obtain a first mixed signal for phase compensation processing;

[0044] The PID servo module in the feedback unit is used to feed back the first mixed signal to the initial driving signal corresponding to one of the every 2-way optical splitting light path, and input to the modulation module corresponding to the initial driving signal through a phase shifter, wherein the phase shifter has 1 / 2n.

[0045] Further, the signal source unit is used to emit n-way initial driving signals, comprising:

[0046] The signal source in the signal source unit is used to emit n-way initial driving signals;

[0047] The second mixer in the signal source unit is used to mix every 2-way initial driving signal;

[0048] Each signal branching module in the n signal branching modules in the signal source unit is used to branch each initial driving signal into 2 ways, one of which enters the second mixer, and the other is used to enter the corresponding modulation module through a phase shifter.

[0049] The present application provides a kind of for ion trap system Multi-Raman light phase locking method and system, beat interference method, the phase difference of laser in two Raman lights in each transmission light path is demodulated, and the relative phase difference of two light paths is locked to preset value by the way of PID feedback regulation, finally, the phase difference between the every 2-way optical splitting light path due to environmental disturbance is eliminated.

[0050] Other features and advantages of the present application will be set forth in the following description, and in part will become apparent to those skilled in the art, or will be learned by practice of the application. The objects and other advantages of the application will be realized and attained by the structures particularly pointed out in the description, claims and drawings. BRIEF DESCRIPTION OF DRAWINGS

[0051] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings used in the embodiments or prior art description. Obviously, the drawings described below are only some embodiments of the present application, and the ordinary skilled in the art can obtain other drawings according to these drawings without any creative effort.

[0052] Figure 1 A principle block diagram of a multi-channel Raman light phase locking system for an ion trap system according to an embodiment of the present application is shown.

[0053] Figure 2 A flow chart of a method for multi-channel Raman light phase locking for an ion trap system according to an embodiment of the present application is shown. DETAILED DESCRIPTION

[0054] In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the following will clearly and completely explain the technical solutions in the embodiments of the present application with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only some embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by the ordinary skilled in the art without any creative effort are within the protection scope of the present application.

[0055] As shown in Figure 1 The present application provides a multi-channel Raman light phase locking system for an ion trap system, which comprises a light source unit, a light splitting path, a signal source unit, a beam combining unit and a feedback unit, wherein,

[0056] The light source unit is configured to emit n initial Raman lights.

[0057] The signal source unit is configured to emit n initial driving signals.

[0058] The light splitting path has n channels, and is configured to transmit the received n initial Raman lights to n ion manipulation modules under the driving of the n initial driving signals, and then into an ion trap for ion manipulation.

[0059] The beam combining unit is configured to sample the frequency and phase between the output lights of every two light splitting paths.

[0060] The feedback unit is configured to perform phase compensation processing on the sampled signals, and feed back to the initial driving signal corresponding to one of the two light splitting paths, so as to eliminate the phase difference between the two light splitting paths due to environmental disturbance, and then input into the ion trap through the corresponding light splitting path.

[0061] The following will be described in detail

[0062] In some embodiments of the present application, the light source module comprises a laser and a first light splitting module, wherein the laser is configured to emit initial Raman light; and the first light splitting module is configured to split the initial Raman light into n paths of initial Raman light.

[0063] In some embodiments of the present application, the light path comprises a modulation module, a transmission light path and a second light splitting module, wherein the modulation module is configured to modulate the initial Raman light emitted by the first light splitting module in frequency and phase under the driving of an initial driving signal; the transmission light path is configured to transmit the light modulated by the modulation module, and the transmission light path can be an optical fiber light path or a spatial light path, both of which are applicable to the present application; and the second light splitting module is configured to split the light transmitted by the transmission light path into two paths, one of which is configured to enter the ion trap after passing through the ion manipulation module, and the other of which is configured to be transmitted to the beam combining unit.

[0064] In some embodiments of the present application, the feedback unit comprises a photodetector (PD), a first frequency mixer, a filter module, a PID servo module and 1 / 2n phase shifters (the phase shifters only change the phase without changing the frequency), wherein the photodetector (PD) is configured to beat the two paths of sampling signals sampled by the beam combining unit to obtain a beat signal, wherein the beat signal is a difference frequency signal of the two paths of signals sampled by the beam combining unit; the first frequency mixer is configured to mix the local oscillator signal emitted by the signal source unit with the beat signal to obtain a first mixed signal for phase compensation processing; and the PID servo module is configured to feed back the first mixed signal to the initial driving signal corresponding to one of the two paths of light paths, and input the initial driving signal to the modulation module corresponding to the initial driving signal through a phase shifter.

[0065] In some embodiments of the present application, the signal source unit comprises a signal source, a second frequency mixer, 1 / 2n phase shifters and n signal branching modules, wherein the signal source is configured to emit n paths of initial driving signals; the second frequency mixer is configured to mix every two paths of initial driving signals; and each signal branching module is configured to split each path of initial driving signal into two paths, one of which is configured to enter the second frequency mixer, and the other of which is configured to enter the corresponding modulation module through a phase shifter. Exemplarily, the signal branching module can adopt a power divider.

[0066] The present application will be described below according to the above description.

[0067] In some embodiments of the present application, as Figure 1As shown, the example is that n is 2, that is, the laser initially emits initial Raman light, the frequency of the initial Raman light is f0 and the phase is φ0, the initial Raman light is divided into two initial Raman lights after passing through the first light splitting module, the frequency and the phase remain unchanged; the light splitting path is two, the AWG emits two initial driving signals, the frequencies of the two driving signals are f1 and f2 respectively, and the phases are φ1 and φ2; when the light is transmitted in the transmission optical path, it will carry a random phase due to environmental disturbance, and the random phases carried by the light when transmitted in the two transmission optical paths are different, which are δφ1 and δφ2 respectively. The signal source can be selected as an AWG (Arbitrary Waveform Generator) for example, and the modulation module can be selected as an AOM (Acousto-optic modulator) for example.

[0068] The steps of eliminating the phase difference are as follows:

[0069] The laser initially emits initial Raman light, which is divided into two by the first light splitting module, and the frequency and the phase remain unchanged, which are f0 and φ0 respectively, after the AWG emits two driving signals, the frequencies of the two driving signals are f1 and f2 respectively, and the phases are φ1 and φ2 respectively, one of which is sent to the AOM after passing through a phase shifter, and the other is directly sent to the AOM, at this time, the frequencies of the light output after passing through the two AOMs are f0+f1 and f0+f2 respectively, and the phases are φ0+φ1 and φ0+φ2 respectively.

[0070] The light output by the two AOMs is transmitted through two optical fiber paths or spatial optical paths respectively, and in the transmission process, it may carry random phases δφ1 and δφ2 respectively due to environmental disturbance, at this time, the frequencies of the light output by the two optical fiber paths or spatial optical paths are f0+f1 and f0+f2 respectively, and the phases are φ0+φ1+δφ1 and φ0+φ2+δφ2 respectively. At this time, if it directly enters the ion manipulation module, it will cause a phase difference between the two lights (and the phase difference is random), which will destroy the coherence between the two lights, thereby affecting the quantum bit operation effect of the ions, therefore, the light output by each optical fiber path or spatial optical path will be divided into two by the second light splitting module, one of which will enter the ion trap after passing through the ion manipulation module, and the other will be transmitted to the beam combining unit for sampling.

[0071] The two beams of light sampled by the beam combining unit are frequency mixed by the PD, (the frequency and the phase are subtracted in the frequency mixing process), the frequency of the electrical signal detected on the PD (the signal after frequency mixing) is f1-f2, and the phase is (φ1-φ2)+δφ1-δφ2.

[0072] In addition, since the AWG outputs two driving signals (frequencies f1 and f2, and phases φ1 and φ2), each of the driving signals is split into two by a signal splitting module, one of which enters the second mixer, and the other of which enters the corresponding modulation module through a phase shifter, so that the signal frequency of the mixed signal of the two driving signals split by the two signal splitting modules and entering the second mixer is f1-f2, and the phase is φ1-φ2, which is used as the local oscillator signal. The local oscillator signal with the frequency f1-f2 and the phase φ1-φ2 and the beat signal with the frequency f1-f2 and the phase (φ1-φ2)+δφ1-δφ2 are input into the first mixer and filtered by the filter module to obtain a direct current term containing the random interference phase difference δφ1-δφ2 in the form of cos(δφ1-δφ2), which is fed back to one of the AOMs (the frequency of the output signal of the selected AOM is f0+f1, and the phase is φ0+φ1) through the phase shifter. At this time, the phase is subtracted, and finally the phase of the optical signal passing through the corresponding optical fiber path or spatial light path becomes φ0+φ1+δφ2. The output phases of the optical fiber path (with the phase φ0+φ1+δφ2) or the spatial light path at this time and the other optical fiber path or spatial light path are synchronized, that is, there is no phase difference, and the phase difference is eliminated. The optical path through which the light passes.

[0073] However, in the Raman light manipulation of the ion trap, the debugging frequency changes over time, but in the present application, the phase synchronization function can still be realized as the signal source outputs two signals f1, φ1 and f2, φ2. The reason is that the signal extracted by the filter module only contains the components of δφ1 and δφ2, which are independent of the initial signal from the signal source, and the frequency f1-f2 of the local oscillator signal output by the second mixer and the signal frequency f1-f2 after the beat are subtracted to become 0 after passing through the first mixer.

[0074] On the other hand, in some embodiments of the present application, as shown in Figure 2 In addition, the present application also provides a method for multi-channel Raman light phase locking of an ion trap system, which is based on the above-mentioned system and can be implemented. Specifically, the method comprises the following steps:

[0075] The light source unit is used to output n initial Raman lights, specifically including: using the laser in the light source module to output the initial Raman light; and using the first light splitting module in the light source module to split the initial Raman light into n initial Raman lights.

[0076] The signal source unit is used to emit n initial driving signals, specifically including using the signal source in the signal source unit to emit n initial driving signals; using a second frequency mixer in the signal source unit to mix every 2 initial driving signals; using each signal branching module in the n signal branching modules in the signal source unit to branch each initial driving signal into 2, one of which enters the second frequency mixer, and the other is used to enter the corresponding modulation module through a phase shifter.

[0077] The n light splitting paths are used to transmit the received n initial Raman lights to the n ion manipulation modules under the driving of the n initial driving signals, and then into the ion trap for ion manipulation, and specifically includes using the modulation module in the light splitting path to modulate the initial Raman light emitted by the first light splitting module in frequency and phase under the driving of the initial driving signal; using the transmission light path in the light splitting path to transmit the light modulated by the modulation module; using the second light splitting module in the light splitting path to split the light transmitted by the transmission light path into 2, one of which is used to enter the ion trap after passing through the ion manipulation module to manipulate the ions, and the other light is transmitted to the beam combining unit.

[0078] The beam combining unit is used to sample the frequency and phase between the output lights of every 2 light splitting paths.

[0079] The feedback unit is used to perform phase compensation processing on the sampled sampling signals and feed back to the initial driving signal corresponding to one of the every 2 light splitting paths, specifically including: using the photodetector (PD) in the feedback unit to beat the 2 sampling signals sampled by the beam combining unit to obtain a beat signal, wherein the beat signal is the difference frequency signal of the 2 signals sampled by the beam combining unit;

[0080] The first frequency mixer in the feedback unit is used to mix the beat signal with the local oscillator signal emitted by the signal source unit to obtain a first mixed signal for phase compensation processing; the PID servo module in the feedback unit is used to feed back the first mixed signal to the initial driving signal corresponding to one of the every 2 light splitting paths, and input to the modulation module corresponding to the initial driving signal through a phase shifter, so as to eliminate the phase difference between the every 2 light splitting paths due to environmental disturbance, and then input to the ion trap through the corresponding light splitting path.

[0081] The above merely describes the preferred embodiments of the present application, and is not intended to limit the present application in any form. Although the present application has been disclosed with the preferred embodiments as above, it is not intended to limit the present application, and any person skilled in the art can make some changes or modifications to the above disclosed technical contents to obtain equivalent embodiments with equivalent changes, as long as the changes or modifications do not depart from the technical solution of the present application. Any simple modification, equivalent change and modification made to the above embodiments according to the technical essence of the present application still belong to the scope of the technical solution of the present application.

Claims

1. A multi-path Raman optical phase locking system for an ion trap system, characterized in that: The system includes a light source unit, a light splitting path, a signal source unit, a beam combining unit and a feedback unit, wherein: A light source unit, configured to emit n-path initial Raman light; A signal source unit, used for sending n initial driving signals; There are n splitting optical paths, which are used to transmit the received n initial Raman lights to n ion manipulation modules and then enter the ion trap to manipulate the ions under the drive of n initial driving signals; The beam combining unit is used to sample the frequency and phase between the output lights of each two split optical paths; The feedback unit is used to perform phase compensation processing on the sampled signal and feed it back to the initial driving signal corresponding to one of each two split light paths to eliminate the phase difference between each two split light paths due to environmental disturbances, and then input it into the ion trap through the corresponding split light path.

2. The system for multi-path Raman optical phase locking of an ion trap system according to claim 1, characterized in that: The light source unit includes a laser and a first light splitting module, wherein: The laser is used to emit initial Raman light; The first light splitting module is used to split the initial Raman light into n paths of initial Raman light.

3. The system for multi-path Raman optical phase locking of an ion trap system according to claim 2, characterized in that: The splitting optical path includes a modulation module and a transmission optical path, wherein: The modulation module is used to modulate the frequency and phase of the initial Raman light emitted by the first light splitting module under the drive of the initial driving signal; The transmission optical path is used to transmit light modulated by the modulation module.

4. The system for multi-path Raman optical phase locking of an ion trap system according to claim 3, characterized in that: The light splitting path further includes a second light splitting module, wherein: The second light splitting module is used to split the light transmitted through the transmission light path into two paths, one of which is used to enter the ion trap after passing through the ion manipulation module, and the other light is transmitted to the beam combining unit.

5. The system for multi-path Raman optical phase locking of an ion trap system according to claim 1, characterized in that: The feedback unit includes a photodetector PD, a first mixer, a filter module, a PID servo module and 1 / 2n phase shifters, wherein: The photodetector PD is used to beat the two sampling signals sampled by the beam combining unit to obtain a beat frequency signal, wherein the beat frequency signal is a difference frequency signal of the two signals sampled by the beam combining unit; The first mixer is used to mix the local oscillator signal emitted by the signal source unit with the beat frequency signal to obtain a first mixed signal for phase compensation processing; The PID servo module is used to feed back the first mixing signal to the initial driving signal corresponding to one of each of the two split optical paths, and input it to the modulation module corresponding to the initial driving signal through a phase shifter.

6. The system for multi-path Raman optical phase locking of an ion trap system according to claim 5, characterized in that: The signal source unit includes a signal source and 1 / 2n phase shifters, wherein: The signal source is used to send n initial driving signals; The signal source unit further includes a second mixer, wherein the second mixer is configured to mix each two initial driving signals.

7. The system for multi-path Raman optical phase locking of an ion trap system according to claim 6, characterized in that: The signal source unit further includes n signal branching modules, wherein: Each signal splitting module is used to split each path of initial driving signal into two paths, one of which enters the second mixer, and the other enters the corresponding modulation module through a phase shifter.

8. A method for multi-path Raman optical phase locking in an ion trap system, characterized in that: The method comprises: Using a light source unit, n initial Raman lights are emitted; A signal source unit is used to send n initial driving signals; Using n-way splitting optical paths, driven by n-way initial driving signals, the received n-way initial Raman light is transmitted to n ion manipulation modules and then enters the ion trap to manipulate the ions; The frequency and phase of the output light of each two split optical paths are sampled by using a beam combining unit; The sampling signal is subjected to phase compensation processing by using a feedback unit and fed back to the initial driving signal corresponding to one of each of the two split light paths to eliminate the phase difference between each of the two split light paths due to environmental disturbances, and then input into the ion trap through the corresponding split light path.

9. The method for multi-path Raman optical phase locking for an ion trap system according to claim 8, characterized in that: Utilize the light source unit to emit n initial Raman lights, including: Utilizing the laser in the light source unit to emit initial Raman light; The initial Raman light is split into n paths of initial Raman light by using the first light splitting module in the light source unit.

10. The method for multi-path Raman optical phase locking for an ion trap system according to claim 9, characterized in that: Utilizing n-way splitting optical paths, driven by n-way initial driving signals, the received n-way initial Raman light is transmitted to n ion manipulation modules respectively, including: Using the modulation module in the splitting optical path, the initial Raman light emitted by the first splitting module is modulated in frequency and phase under the drive of the initial driving signal; Utilizing the transmission optical path in the split optical path to transmit the light modulated by the modulation module; The second splitter module in the splitter light path is used to split the light transmitted through the transmission light path into two paths, one of which is used to enter the ion trap after passing through the ion manipulation module, and the other light is transmitted to the beam combining unit.

11. The method for multi-path Raman optical phase locking for an ion trap system according to claim 8, characterized in that: The feedback unit is used to perform phase compensation processing on the sampled signal and feed it back to the initial driving signal corresponding to one of the two split optical paths, including: The photodetector PD in the feedback unit is used to beat the two sampling signals sampled by the beam combining unit to obtain a beat frequency signal, wherein the beat frequency signal is a difference frequency signal of the two signals sampled by the beam combining unit; Using the first mixer in the feedback unit, the local oscillator signal emitted by the signal source unit is mixed with the beat frequency signal to obtain a first mixed signal for phase compensation processing; The PID servo module in the feedback unit is used to feed back the first mixing signal to the initial driving signal corresponding to one of the two split optical paths, and input it to the modulation module corresponding to the initial driving signal through a phase shifter, wherein there are 1 / 2n phase shifters.

12. The method for multi-path Raman optical phase locking for an ion trap system according to claim 11, characterized in that: A signal source unit is used to send n initial driving signals, including: Using the signal source in the signal source unit, n initial driving signals are sent out; Using the second mixer in the signal source unit, each of the two initial drive signals is mixed; Each of the n signal branching modules in the signal source unit is used to split each initial driving signal into two paths, one of which enters the second mixer and the other enters the corresponding modulation module through a phase shifter.

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