Multi-path Raman light phase locking system and method for ion trap system

Abstract

The invention provides a multipath Raman light phase locking system for an ion trap system, the system comprises a light source unit, a light splitting light path, a signal source unit, a beam combining unit and a feedback unit, the light source unit is used for emitting n paths of initial Raman light; the signal source unit is used for sending n paths of initial driving signals; the n light splitting optical paths are used for transmitting the received n paths of initial Raman light to the n ion control modules respectively under the driving of the n paths of initial driving signals, and then the n paths of initial Raman light enter the ion trap for ion control; the beam combining unit is used for sampling the frequency and the phase between the output light of every two light splitting light paths; and the feedback unit is used for carrying out phase compensation processing on the sampled signal after sampling and feeding back to the initial driving signal corresponding to one of every two light splitting optical paths. According to the invention, the phase difference generated by environmental disturbance between every two light splitting optical paths can be eliminated.

Description

Technical Field

[0001] The present invention belongs to the technical field of quantum computing, and in particular relates to a system and method for multi-path Raman optical phase locking of an ion trap system. Background Art

[0002] Ion trap quantum computers are one of the possible routes to achieve large-scale quantum computing today. In ion traps, bilateral Raman lasers are often used to address ions and perform quantum bit operations. Two beams of Raman light are simultaneously irradiated onto the ions through different optical paths. In order to ensure the coherence of the two lasers, there are high requirements for the phase stability between the two lasers. However, the optical paths through which the two beams of light pass (including spatial optical paths or spatial optical paths), especially optical fiber optical paths, are easily disturbed by external vibrations and temperature fluctuations. These disturbances will change the phase of each beam of light, and ultimately cause a phase difference between the two beams of light (and the phase difference is random), destroying the coherence between the two beams of light, thereby affecting the quantum bit operation effect of the ions.

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

[0004] In view of the above problems, the present invention provides a method for multi-path Raman optical phase locking of an ion trap system, the method comprising:

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

[0006] A light source unit, used for emitting n initial Raman lights;

[0007] A signal source unit, used for sending n initial driving signals;

[0008] There are n splitting optical paths, which are used to transmit the received n initial Raman lights to n ion manipulation modules respectively and then enter the ion trap to manipulate the ions under the drive of n initial driving signals;

[0009] A beam combining unit, used for sampling the frequency and phase between the output lights of each two split light paths;

[0010] 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 caused by environmental disturbances, and then input it into the ion trap through the corresponding split light path.

[0011] Furthermore, the light source module includes a laser and a first light splitting module, wherein:

[0012] The laser is used to emit initial Raman light;

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

[0014] Furthermore, the split light path includes a modulation module and a transmission light path, wherein:

[0015] 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;

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

[0017] Furthermore, the light splitting path further includes a second light splitting module, wherein:

[0018] 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.

[0019] Furthermore, the feedback unit includes a photodetector PD, a first mixer, a filter module, a PID servo module and 1 / 2n phase shifters, wherein:

[0020] The photoelectric detector 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;

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

[0022] 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 light paths, and input it to the modulation module corresponding to the initial driving signal through a phase shifter.

[0023] Furthermore, the signal source unit includes a signal source and 1 / 2n phase shifters, wherein:

[0024] The signal source is used to send n initial driving signals;

[0025] The signal source unit further includes a second mixer, wherein the second mixer is used to mix each two initial driving signals.

[0026] Furthermore, the signal source unit further includes n signal branching modules, wherein:

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

[0028] On the other hand, the present invention also provides a method for multi-path Raman optical phase locking of an ion trap system, characterized in that the method comprises:

[0029] Using a light source unit, n initial Raman lights are emitted;

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

[0031] Using n-way split light paths, under the drive of n-way initial driving signals, the received n-way initial Raman lights are respectively transmitted to n ion manipulation modules and then enter the ion trap to manipulate the ions;

[0032] The frequency and phase between the output lights of each two split light paths are sampled by using a beam combining unit;

[0033] The sampled 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.

[0034] Furthermore, using the light source unit, n initial Raman lights are emitted, including:

[0035] Using the laser in the light source module to emit initial Raman light;

[0036] The initial Raman light is divided into n paths of initial Raman light by using the first light splitting module in the light source module.

[0037] Furthermore, using n-way split light paths, under the drive of n-way initial driving signals, the received n-way initial Raman lights are respectively transmitted to n ion manipulation modules, including:

[0038] Using the modulation module in the split light path, the initial Raman light emitted by the first split light module is modulated in frequency and phase under the drive of the initial driving signal;

[0039] The light modulated by the modulation module is transmitted by utilizing the transmission optical path in the split optical path;

[0040] The second splitter module in the splitter optical path is used to split the light transmitted through 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 is transmitted to the beam combining unit.

[0041] Furthermore, the sampled signal is subjected to phase compensation processing by using a feedback unit, and is fed back to an initial driving signal corresponding to one of each of the two split light paths, including:

[0042] The two sampling signals sampled by the beam combining unit are beat by the photodetector PD in the feedback unit to obtain a beat frequency signal, wherein the beat frequency signal is a difference frequency signal of the two sampling signals sampled by the beam combining unit;

[0043] Using the first mixer in the feedback unit, the local oscillator signal sent by the signal source unit is mixed with the beat frequency signal to obtain a first mixed signal for phase compensation processing;

[0044] The first mixing signal is fed back to the initial driving signal corresponding to one of each of the two split optical paths by using the PID servo module in the feedback unit, and is input to the modulation module corresponding to the initial driving signal through a phase shifter, wherein there are 1 / 2n phase shifters.

[0045] Furthermore, a signal source unit is used to send n initial driving signals, including:

[0046] Using the signal source in the signal source unit, n initial driving signals are sent out;

[0047] Using the second mixer in the signal source unit, each of the two initial drive signals is mixed;

[0048] Each of the n signal branching modules in the signal source unit is used to divide each initial driving signal into two paths, 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 invention provides a method and system for multi-path Raman light phase locking of an ion trap system, a beat frequency interference method, which demodulates the phase difference of lasers in two Raman lights passing through respective transmission light paths, and locks the relative phase difference of the two light paths to a preset value through PID feedback regulation, thereby ultimately eliminating the phase difference between each two split light paths caused by environmental disturbances.

[0050] Other features and advantages of the present invention will be described in the following description, and partly become apparent from the description, or understood by practicing the present invention. The purpose and other advantages of the present invention can be realized and obtained by the structures pointed out in the description, claims and drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0051] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, a brief introduction is given below to the drawings to be used in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

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

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

[0054] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0055] like Figure 1 As shown, the present invention provides a multi-path Raman optical phase locking system for an ion trap system, the system comprising a light source unit, a splitting optical path, a signal source unit, a beam combining unit and a feedback unit, wherein:

[0056] A light source unit, used for emitting n initial Raman lights;

[0057] A signal source unit, used for sending n initial driving signals;

[0058] There are n splitting optical paths, which are used to transmit the received n initial Raman lights to n ion manipulation modules respectively and then enter the ion trap to manipulate the ions under the drive of n initial driving signals;

[0059] A beam combining unit, used for sampling the frequency and phase between the output lights of each two split light paths;

[0060] 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 caused by environmental disturbances, and then input it into the ion trap through the corresponding split light path.

[0061] The following is a detailed description

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

[0063] In some embodiments of the present invention, the optical splitter path includes a modulation module, a transmission optical path, and a second optical splitter module, wherein the modulation module is used to modulate the frequency and phase of the initial Raman light emitted by the first optical splitter module under the drive of the initial driving signal; the transmission optical path is used to transmit the light modulated by the modulation module, and illustratively, the transmission optical path is an optical fiber optical path or a spatial optical path, both of which are applicable to the present invention. The second optical splitter module is used to split the light transmitted through 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 light is transmitted to the beam combining unit.

[0064] In some embodiments of the present invention, the feedback unit includes a photodetector PD, a first mixer, a filtering module, a PID servo module and 1 / 2n phase shifters (the phase shifter only changes the phase but not the frequency), wherein the photodetector PD is used to beat the two 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 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 signal to obtain a first mixed signal for phase compensation processing; the PID servo module is used to feed back the first mixed signal to the initial drive signal corresponding to one of each of the two split optical paths, and input it into the modulation module corresponding to the initial drive signal through a phase shifter.

[0065] In some embodiments of the present invention, the signal source unit includes a signal source, a second mixer, 1 / 2n phase shifters, and n signal branching modules, wherein the signal source is used to send out n initial drive signals; the second mixer is used to mix every 2 initial drive signals. Each signal branching module is used to divide each initial drive signal into 2 paths, one of which enters the second mixer, and the other is used to enter the corresponding modulation module through a phase shifter. Exemplarily, the signal branching module can use a power divider (power distributor).

[0066] The present invention is exemplarily described below based on the above description.

[0067] In some embodiments of the present invention, Figure 1As shown, for example, 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, and the initial Raman light is divided into 2 initial Raman lights after passing through the first splitter module, and the frequency and phase remain unchanged; the splitter optical path is 2, and the AWG sends 2 initial drive signals, the frequencies of the 2 drive signals are f1 and f2, 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 disturbances, and the random phases carried by the light in the 2 transmission optical paths are different, δφ1 and δφ2. For example, the signal source can be selected as AWG (Arbitrary Waveform Generator), and the modulation module can be selected as AOM (Acousto-optic modulator).

[0068] The steps to eliminate the phase difference are as follows:

[0069] The laser initially emits initial Raman light, which is divided into two paths by the first optical splitter module. The frequency and phase remain unchanged, both f0 and φ0. After the AWG sends out two drive signals, the frequencies of the two drive signals are f1 and f2, and the phases are φ1 and φ2. One of them is sent to the AOM after passing through a phase shifter, and the other is sent directly to the AOM. At this time, the frequencies of the output lights after modulation by the two AOMs are f0+f1 and f0+f2, and the phases are φ0+φ1 and φ0+φ2.

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

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

[0072] In addition, since the AWG will send out two drive signals (with frequencies of f1 and f2, and phases of φ1 and φ2, respectively), each drive signal is divided into two by a signal branching module, one of which enters the second mixer, and the other is used to enter the corresponding modulation module through a phase shifter. Therefore, the two drive signals divided by the two signal branching modules enter the second mixer for mixing, and the signal frequency after mixing is f1-f2 and the phase is φ1-φ2, which is used as the local oscillator signal. A local oscillator signal with a frequency of f1-f2 and a phase of φ1-φ2 ​​and a beat frequency signal with a frequency of f1-f2 and a phase of (φ1-φ2)+δφ1-δφ2 are input into the first mixer together and filtered by the filtering module to obtain a DC term containing a random interference phase difference δφ1-δφ2 in the form of cos(δφ1-δφ2). The DC term 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 a phase shifter. At this time, the phases are subtracted, and finally the phase of the optical signal passing through the corresponding optical fiber path or spatial optical path is changed to φ0+φ1+δφ2. The output phase of the optical fiber path or spatial optical path at this time is synchronized with that of another optical fiber path (phase is φ0+φ1+δφ2) or spatial optical path, that is, there is no phase difference, and the phase difference is eliminated.

[0073] However, in the Raman light manipulation of the ion trap, the debugging frequency will change with time. In the present invention, as the two signals f1, φ1 and f2, φ2 emitted by the signal source change, the phase synchronization function of the present invention can still be achieved. The reason is that the signal extracted by the filtering module only contains the components of δφ1 and δφ2, which are independent of the initial signal emitted by the signal source. The frequency f1-f2 of the local oscillator signal output by the second mixer and the frequency f1-f2 of the signal after the beat frequency are subtracted after the first mixer and become 0.

[0074] On the other hand, in some embodiments of the present invention, Figure 2 As shown, a method for multi-path Raman optical phase locking of an ion trap system is also provided. The method can be implemented based on the above system. Specifically, the method includes:

[0075] Using the light source unit to emit n initial Raman lights specifically includes: using the laser in the light source module to emit initial Raman lights; using the first light splitting module in the light source module to split the initial Raman lights into n initial Raman lights.

[0076] A signal source unit is used to send out n initial drive signals, specifically including using the signal source in the signal source unit to send out n initial drive signals; using the second mixer in the signal source unit to mix every 2 initial drive signals; using each signal branching module in the n signal branching modules in the signal source unit to divide each initial drive signal into 2 paths, one of which enters the second mixer, and the other is used to enter the corresponding modulation module through a phase shifter.

[0077] By utilizing n-way split light paths, under the drive of n-way initial driving signals, the received n-way initial Raman lights are respectively transmitted to n ion manipulation modules and then enter the ion trap to manipulate the ions. Specifically, the method also includes utilizing a modulation module in the split light path, under the drive of the initial driving signal, modulating the frequency and phase of the initial Raman light emitted by the first split light module; utilizing a transmission light path in the split light path, transmitting the light modulated by the modulation module; utilizing a second split light path in the split light path, dividing 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 to manipulate the ions, and the other light is transmitted to the beam combining unit.

[0078] The frequency and phase between the output lights of each two split light paths are sampled by using a beam combining unit;

[0079] The feedback unit is used to perform phase compensation processing on the sampled signal, and the phase compensation processing is fed back to the initial driving signal corresponding to one of each of the two split light paths, specifically including: using the photodetector PD in the feedback unit 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;

[0080] The first mixer in the feedback unit 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 in the feedback unit is used to feed back the first mixed signal to the initial driving signal corresponding to one of each of the two split light paths, and input it to the modulation module corresponding to the initial driving signal through a phase shifter to eliminate the phase difference between each of the two split light paths caused by environmental disturbances, and then input it into the ion trap through the corresponding split light path.

[0081] The above is only a preferred embodiment of the present invention, and does not limit the present invention in any form. Although the present invention has been disclosed as a preferred embodiment as above, it is not used to limit the present invention. Any technician familiar with this profession can make some changes or modifications to equivalent embodiments of equivalent changes using the technical contents disclosed above without departing from the scope of the technical solution of the present invention. However, any simple modification, equivalent change and modification made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solution of the present invention still fall within the scope of the technical solution of the present invention.

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, used for emitting n initial Raman lights; 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 respectively and then enter the ion trap to manipulate the ions under the drive of n initial driving signals; A beam combining unit, used for sampling the frequency and phase between the output lights of each two split light 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 caused by environmental disturbances, and then input it into the ion trap through the corresponding split light path.

2. A system for multi-path Raman optical phase locking of an ion trap system according to claim 1, characterized in that: The light source module 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. A system for multi-path Raman optical phase locking of an ion trap system according to claim 2, characterized in that: The split light path includes a modulation module and a transmission light 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. A system for multi-path Raman optical phase locking of an ion trap system according to claim 3, characterized in that: The light splitting path also 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 photoelectric detector 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 sent 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 light paths, and input it to the modulation module corresponding to the initial driving signal through a phase shifter.

6. A 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 used to mix each two initial driving signals.

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

8. A method for multi-path Raman optical phase locking of 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 split light paths, under the drive of n-way initial driving signals, the received n-way initial Raman lights are respectively transmitted to n ion manipulation modules and then enter the ion trap to manipulate the ions; The frequency and phase between the output lights of each two split light paths are sampled by using a beam combining unit; The sampled 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 of an ion trap system according to claim 8, characterized in that: Using the light source unit, n initial Raman lights are emitted, including: Using the laser in the light source module to emit initial Raman light; The initial Raman light is divided into n paths of initial Raman light by using the first light splitting module in the light source module.

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

11. The method for multi-path Raman optical phase locking of an ion trap system according to claim 8, characterized in that: The sampled signal is subjected to phase compensation processing by using a feedback unit, and is fed back to an initial driving signal corresponding to one of each of the two split light paths, including: The two sampling signals sampled by the beam combining unit are beat by the photodetector PD in the feedback unit to obtain a beat frequency signal, wherein the beat frequency signal is a difference frequency signal of the two sampling signals sampled by the beam combining unit; Using the first mixer in the feedback unit, the local oscillator signal sent by the signal source unit is mixed with the beat frequency signal to obtain a first mixed signal for phase compensation processing; The first mixing signal is fed back to the initial driving signal corresponding to one of each of the two split optical paths by using the PID servo module in the feedback unit, and is input 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 of an ion trap system according to claim 11, characterized in that: The 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 divide each initial driving signal into two paths, one of which enters the second mixer and the other is used to enter the corresponding modulation module through a phase shifter.

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