Six-beam phase-sensitive amplifier based on four-wave mixing process

Abstract

The utility model discloses a six-beam phase-sensitive amplifier based on a four-wave mixing process. The six-beam phase-sensitive amplifier comprises a laser, a plurality of half-wave plates, a plurality of reflectors, a plurality of polarization beam splitters, a beam splitter, a plurality of acoustic optical modulators, piezoelectric ceramics, a Glan laser prism, a rubidium atom pool, a Glan-Thompson prism, a beam collector, a plurality of photoelectric detectors, a subtracter, a microcontroller and a spectrum analyzer. By adjusting the polarization state and path of the laser beam, the light beam is subjected to four-wave mixing in the rubidium atom pool, and quantum compression is generated. The six-beam phase-sensitive amplifier provided by the utility model can be used for realizing quantum compression enhancement and improving the fidelity of quantum information processing and the precision of quantum precision measurement.

Description

Technical Field

[0001] The utility model belongs to the technical field of measuring equipment and relates to a six-beam phase-sensitive amplifier based on a four-wave mixing process. Background Art

[0002] As an indispensable quantum resource in the field of quantum precision measurement and quantum information, quantum compression has important significance and value in quantum optics. Due to its noise suppression characteristics, quantum compression has been widely used in gravitational wave detection, laser beam positioning, quantum imaging, and quantum plasma sensing. Multi-beam quantum compression not only has compression characteristics, but also realizes the sharing of quantum correlations between multiple beams. This provides a new direction for the application of quantum technology and is crucial for realizing more complex optical operations and improving measurement accuracy.

[0003] As a quantum resource that reduces quantum noise and significantly improves system performance, the degree of compression of quantum compression directly determines the degree of improvement in system performance. However, the current multi-beam quantum compression still faces some challenges, and its compression degree is relatively low. At the same time, due to the existence of factors such as inevitable transmission loss, detection loss, and the introduction of additional noise, its scope and effect in practical applications are further limited. Only by further improving the degree of multi-beam quantum compression can its potential advantages be brought into play and new possibilities for its further practical application be opened up. Existing technologies such as Interference-Induced Quantum Squeezing Enhancement in a Two-beam Phase-Sensitive Amplifier achieve a two-beam quantum compression enhancement, which cannot achieve multi-beam quantum compression enhancement. The device of the utility model can achieve multi-beam quantum compression enhancement through phase-sensitive amplification. Utility Model Content

[0004] In order to solve the deficiencies in the prior art, the purpose of the utility model is to provide a six-beam phase-sensitive amplifier based on a four-wave mixing process. The six-beam phase-sensitive amplifier provided by the utility model can achieve quantum compression enhancement. Compared with the six-beam non-phase-sensitive amplifier in the prior art with an intensity difference compression of about 5.05dB, the six-beam phase-sensitive amplifier of the utility model achieves an intensity difference compression of about 6.64dB, achieving an enhancement of the intensity difference compression.

[0005] In addition to single-pump four-wave mixing reaction, the device of the utility model can also produce double-pump four-wave mixing reaction to produce quantum compression of multiple beams, which is applied to some specific experimental needs. At present, the compression degree of multiple beams is relatively low. The six-beam phase-sensitive amplifier of the utility model device produces quantum compression of multiple beams, and the effect is better than that of the non-phase-sensitive amplifier.

[0006] With the continuous development of quantum information technology, the complexity of quantum information systems has increased, and multi-beam quantum correlation has become one of the important resources for building complex quantum information systems. Compared with non-phase-sensitive amplifiers, phase-sensitive amplifiers can enhance quantum correlation. The phase-sensitive amplifier described in the utility model is a six-beam phase-sensitive amplifier, which is mainly characterized by generating six-beam quantum correlation and achieving six-beam quantum correlation enhancement.

[0007] The utility model provides a six-beam phase-sensitive amplifier based on a four-wave mixing process, the six-beam phase-sensitive amplifier comprising: a laser, a plurality of half-wave plates, a plurality of reflectors, a plurality of polarization beam splitters, a beam splitter, a plurality of acousto-optic modulators, piezoelectric ceramics, a Glan laser prism, a rubidium atom pool, a Glan-Thompson prism, a beam collector, a plurality of photodetectors, a subtractor, a microcontroller and a spectrum analyzer;

[0008] The laser is a titanium sapphire laser, which is used to excite and emit a laser beam;

[0009] A first half-wave plate and a first polarization beam splitter are sequentially arranged along the optical path of the laser beam emitted by the laser;

[0010] The first half-wave plate is used to change the polarization state of the laser beam, so that the horizontal polarization and vertical polarization components of the laser beam after passing through the first half-wave plate are different when passing through the polarization beam splitter; the first polarization beam splitter splits the laser beam into a first laser beam and a second laser beam according to the horizontal polarization and vertical polarization components;

[0011] A first reflector, a second half-wave plate, and a second polarization beam splitter are sequentially arranged along the optical path of the first laser beam;

[0012] The first reflector is used to change the optical path direction of the first laser beam; the second half-wave plate is used to change the polarization direction of the first laser beam, so that the horizontal polarization and vertical polarization components of the first laser beam are different, and cooperate with the second polarization beam splitter to change the power of the two pump beams; the second polarization beam splitter is used to split the first laser beam into a third laser beam and a fourth laser beam; the polarization direction of the third laser beam is horizontal, and the polarization direction of the fourth laser beam is vertical;

[0013] A third half-wave plate, a second reflector, and a Glan laser prism are sequentially arranged along the optical path of the third laser beam;

[0014] The third half-wave plate is used to change the polarization direction of the third laser beam, and change the polarization state of the third laser beam from horizontal to vertical; the second reflector is used to change the optical path direction of the third laser beam; the Glan laser prism is used to combine the laser beams;

[0015] One or more reflectors and Glan laser prisms are sequentially arranged along the optical path of the fourth laser beam;

[0016] One or more of the reflectors (including the third reflector and the fourth reflector) are used to change the optical path direction of the fourth laser beam; the Glan laser prism is used to combine the laser beams;

[0017] The optical path of the third laser beam after being reflected by the second reflector directly enters the Glan laser prism without passing through the fourth reflector;

[0018] A fourth half-wave plate and a beam splitter are sequentially arranged along the optical path of the second laser beam;

[0019] The fourth half-wave plate is used to change the polarization direction of the second laser beam, and change the polarization direction of the second laser beam from vertical to horizontal; the beam splitter is used to split the second laser beam into a fifth laser beam and a sixth laser beam, and the beam splitter used here is not sensitive to polarization, and the beam splitting ratio is 50:50;

[0020] A first acousto-optic modulator, a reflector group, and a Glan laser prism are sequentially arranged along the optical path of the fifth laser beam;

[0021] The first acousto-optic modulator performs frequency shift on the fifth laser beam, and after the frequency shift, the fifth laser beam is blue-detuned by 3.04 GHz relative to the pump beam (the third laser beam or the fourth laser beam); the reflector group includes a fifth reflector and a sixth reflector, which are used to change the optical path direction of the fifth laser beam; the Glan laser prism is used for combining laser beams;

[0022] A seventh reflector, a second acousto-optic modulator, a piezoelectric ceramic, an eighth reflector, and a Glan laser prism are sequentially arranged along the optical path of the sixth laser beam;

[0023] The seventh reflector is used to change the optical path direction of the sixth laser beam; the second acousto-optic modulator performs frequency shift on the sixth laser beam, and after the frequency shift, the sixth laser beam is red-detuned by 3.04 GHz relative to the pump beam; the eighth reflector and the piezoelectric ceramic are used to change the optical path direction of the sixth laser beam; the piezoelectric ceramic is also used to receive the feedback signal of the microcontroller; the Glan laser prism is used for beam combination;

[0024] The third laser beam, the fourth laser beam, the fifth laser beam and the sixth laser beam are emitted from the Glan-Thompson laser prism together, a rubidium atom pool, a Glan-Thompson prism, a plurality of photodetectors, a subtractor and a microcontroller are arranged along the optical path, and the spectrum analyzer is arranged after the subtractor; a beam collector is also arranged at the reflection position of the Glan-Thompson prism;

[0025] The rubidium atomic pool is 12 mm long and serves as a medium for the four-wave mixing process. The temperature during the four-wave mixing process is heated to 112.7°C. The Glan-Thompson prism is used to filter out the remaining pump light. The photodetector includes a first photodetector and a second photodetector. 5 The transimpedance gain of V / A and quantum efficiency of 97% are used to detect DC signals and RF signals; the resolution bandwidth and video bandwidth of the spectrum analyzer are set to 30kHz and 300Hz respectively, which are used to analyze RF signals; the microcontroller is used to calculate and process the DC signal received by the photodetector, and send the processed output feedback signal to the piezoelectric ceramic in the probe optical path to achieve phase locking control.

[0026] The first polarization beam splitter and the second polarization beam splitter change the splitting ratio by rotating the first half-wave plate and the second half-wave plate respectively; in a specific embodiment, the splitting ratio is 50:50.

[0027] The rubidium atomic pool is single pumped 85 Four-wave mixing process and dual pumping in Rb double Λ-level structure 85 Rb double Λ-level structure four-wave mixing process.

[0028] The third laser beam and the fourth laser beam are pumping lights, and the included angle in the vertical plane is 8 mrad; the sixth laser beam is probe light, and the fifth laser beam is conjugate light, and the included angle in the horizontal plane between the sixth laser beam and the fifth laser beam is 10 mrad.

[0029] The beneficial effects of the utility model include: under different pump powers, the intensity difference compression of the six-beam phase-sensitive amplifier is always significantly higher than that of the non-phase-sensitive amplifier. The power of the probe light and the conjugate light is set at 15μW, and the power of different pumps is changed by controlling the variables, and the intensity difference compression under phase-sensitive and non-phase-sensitive conditions is compared. First, the power of pump light 2 is controlled to be 150mW, and the power of pump light 1 is gradually changed from 30mW to 150mW. The intensity difference compression under phase-sensitive and non-phase-sensitive conditions is measured, which is significantly higher than that of the non-phase-sensitive amplifier.

[0030] By controlling the power of pump light 1 to 150mW and changing the power of pump light 2 gradually from 30mW to 150mW, the intensity difference compression in phase-sensitive and non-phase-sensitive cases was studied, which was still significantly higher than that of the non-phase-sensitive amplifier.

[0031] When the power of pump light 1 and pump light 2 is 150mW, the intensity difference compression of the six-light phase-sensitive amplifier reaches about 6.64dB, which is about 1.60dB higher than that of the non-phase-sensitive amplifier. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For those skilled in the art, other drawings can be obtained based on these drawings without paying creative work.

[0033] Figure 1 (a), (b), and (c) are schematic diagrams of the six-beam phase-sensitive amplifier scheme of the utility model.

[0034] Figure 2 It is a structural schematic diagram of the six-beam phase-sensitive amplifier of the utility model.

[0035] Figure 3 It is a schematic diagram of the light spot in the light spot analyzer of the utility model.

[0036] Figure 4 (a) and (b) are schematic diagrams for comparing strength difference compression of the utility model.

[0037] Figure 2 In the figure, 1-laser, 2-first half-wave plate, 3-first polarization beam splitter, 4-first reflector, 5-second half-wave plate, 6-second polarization beam splitter, 7-third half-wave plate, 8-second reflector, 9-third reflector, 10-fourth reflector, 11-fourth half-wave plate, 12-beam splitter, 13-seventh reflector, 14-first acousto-optic modulator, 15-second acousto-optic modulator, 16-fifth reflector, 17-sixth reflector, 18-eighth reflector, 19-piezoelectric ceramics, 20-Glan laser prism, 21-rubidium atomic cell, 22-Glan-Thompson prism, 23-beam collector, 24-first photodetector, 25-second photodetector, 26-subtractor, 27-spectrum analyzer, 28-microcontroller. DETAILED DESCRIPTION

[0038] The utility model is further described in detail with reference to the following specific embodiments and drawings. The process, conditions, experimental methods, etc. for implementing the utility model, except for the contents specifically mentioned below, are all common knowledge and common common sense in the field, and the utility model has no special restrictions.

[0039] In the description of the present invention, it should be noted that the terms "first", "second" and "third" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0040] In the description of the present invention, "plurality" means two or more than two, unless otherwise clearly and specifically defined.

[0041] The disclosure below provides corresponding implementation or example to realize the structure of the present application. In order to simplify the disclosure of the present application, the parts and settings of specific examples are described below. Of course, they are only examples, and the purpose is not to limit the present application. In addition, the present application can repeat reference numerals and / or reference letters in different examples, and this repetition is for the purpose of simplification and clarity, and itself does not indicate the relationship between the various implementations and / or settings discussed.

[0042] The utility model provides a six-beam phase-sensitive amplifier based on a four-wave mixing process, and the six-beam phase-sensitive amplifier includes: a laser 1, multiple half-wave plates, multiple reflectors, multiple polarization beam splitters, a beam splitter 12, multiple acousto-optic modulators, a piezoelectric ceramic 19, a Glan laser prism 20, a rubidium atom pool 21, a Glan-Thompson prism 22, a beam collector 23, multiple photodetectors, a subtractor 26, a microcontroller 28 and a spectrum analyzer 27; by adjusting the polarization state and path of the laser beam, the light beam undergoes four-wave mixing in the rubidium atom pool 21 to generate quantum compression. During the four-wave mixing process, a specific light beam is set as pump light, probe light and conjugate light to optimize the fidelity and measurement accuracy of quantum information processing. The photodetector detects the light beam after the amplification process, and its DC signal is processed by the microcontroller 28 to achieve phase locking, thereby enhancing the stability and efficiency of the system. The Glan-Thompson prism 22 is used to filter the remaining pump light to separate the pump light and the light to be measured. The six-beam phase-sensitive amplifier in the utility model can be used to achieve quantum compression enhancement, improve the fidelity of quantum information processing and the accuracy of quantum precision measurement.

[0043] The utility model discloses a six-beam phase-sensitive amplifier based on a four-wave mixing process, such as Figure 2 As shown, it includes a laser 1, a plurality of half-wave plates, a plurality of reflectors, a plurality of polarization beam splitters, a beam splitter 12, a plurality of acousto-optic modulators, a piezoelectric ceramic 19, a Glan laser prism 20, a rubidium atom cell 21, a Glan-Thompson prism 22, a beam collector 23, a plurality of photodetectors, a subtractor 26, a microcontroller 28 and a spectrum analyzer 27;

[0044] The phase-sensitive amplifier is used to generate quantum compression, which can improve the fidelity of quantum information processing and the accuracy of quantum precision measurement. The laser emitted by the titanium sapphire laser 1 is divided into a first laser beam and a second laser beam after passing through the first half-wave plate 2 and the first polarization beam splitter 3 in sequence. The first laser beam passes through the first reflector 4 and the second half-wave plate 5 and is divided into two beams of 50:50 by the second polarization beam splitter 6. The second laser beam passes through the fourth half-wave plate 11 and the beam splitter 12, and then enters the first acousto-optic modulator 14 and the second acousto-optic modulator 15 respectively, generating red-shifted injection probe light and blue-shifted injection conjugate light. The four beams are combined by the Glan laser prism 20 and injected into the rubidium atomic pool 21.

[0045] In a six-beam phase-sensitive amplifier implementation device based on a four-wave mixing process described in the utility model, a quantum compression of about 6.64dB is obtained through the four-wave mixing process, which is about 1.60dB higher than that of a non-phase-sensitive amplifier.

[0046] In the six-beam phase-sensitive amplifier implementation device based on the four-wave mixing process described in the utility model, the first acousto-optic modulator 14 and the second acousto-optic modulator 15 are respectively connected to the radio frequency signal generator and the amplifier, and the radio frequency signal generator and the amplifier drive the acousto-optic modulator to shift the frequency of the fifth laser beam and the sixth laser beam by 1.52 GHz.

[0047] In the six-beam phase-sensitive amplifier implementation device based on the four-wave mixing process described in the utility model, the angle between the two pump lights (the third laser beam and the fourth laser beam) in the vertical plane is 8mrad, and the angle between the probe light (the sixth laser beam) and the conjugate light (the fifth laser beam) in the horizontal plane is 10mrad.

[0048] In the implementation device of the six-beam phase-sensitive amplifier based on the four-wave mixing process described in the utility model, the rubidium atomic pool 21 is 12 mm long, and the temperature is stabilized at 112.7° C. when four-wave mixing occurs.

[0049] In the implementation device of the six-beam phase-sensitive amplifier based on the four-wave mixing process described in the utility model, a beam collector 23 is provided at the reflection part of the Glan-Thompson prism 22 for collecting the remaining pump light.

[0050] Example

[0051] The detailed experimental setup for realizing a six-beam phase-sensitive amplifier is presented. First, a Ti:Sapphire laser 1 generates a phase-sensitive amplifier with a frequency relative to 85 Rb D1 line (5S 1 / 2 ,F=2→5P 1 / 2 ) A laser beam with a red detuning of 1 GHz is split into two beams by the first polarization beam splitter 3 after passing through the first half-wave plate 2. Among them, the first laser beam is split into two pump light beams with a ratio of 50:50 after passing through the first reflector 4, the second half-wave plate 5 and the second polarization beam splitter 6, which are the third laser beam and the fourth laser beam, respectively. The power of the two pump light beams is about 150 mW. At the same time, the second laser beam is also split into two beams after passing through the fourth half-wave plate 11 and the beam splitter 12, and is frequency-shifted by the first acousto-optic modulator 14 and the second acousto-optic modulator 15, respectively. The beam that is detuned by about 3.04 GHz with respect to the red of the pump beam after frequency shift is called the probe light (the sixth laser beam), and the beam that is detuned by about 3.04 GHz with respect to the blue of the pump beam is called the conjugate light (the fifth laser beam). The power of the probe light and the conjugate light is about 15 μW. Under these experimental conditions, the phase-sensitive amplifier outputs a six-beam associated spot pattern as shown in FIG. Figure 3 After passing through the Glan laser prism 20, the pump light, probe light and conjugate light are 85 The two pump beams (the third laser beam and the fourth laser beam) intersect at the center of the Rb atomic vapor pool (the rubidium atomic pool 21). The two pump beams (the third laser beam and the fourth laser beam) form an angle of 8 mrad in the vertical plane, and the probe light and the conjugate light form an angle of 10 mrad in the horizontal plane. The waist spot sizes of the pump light, the probe light, and the conjugate light are approximately 600 μm, 300 μm, and 300 μm, respectively. 85 The length of the Rb atomic vapor pool is 12 mm, and the temperature is stabilized at 112.7 ° C. The probe light and conjugate light output by the phase-sensitive amplification process are sent to two photodetectors for detection respectively, and the remaining pump beam is detected by a 10 5 The photodetector used in the detection process has a 10 5 The transimpedance gain of V / A and quantum efficiency of 97%. In order to achieve internal phase locking of the phase-sensitive amplifier, the direct current (dc) component of the detector is sent to the microcontroller (MCU) 28. The microcontroller 28 can achieve phase locking by sending a feedback signal to the piezoelectric ceramic 19 in the probe light path. The radio frequency (rf) components of the two photodetectors are subtracted by the subtractor 26 and input to the spectrum analyzer (SA) 27 for analysis. The resolution bandwidth and video bandwidth of the spectrum analyzer 27 are set to 30kHz and 300Hz respectively.

[0052] Figure 1 This is the six-beam phase-sensitive amplifier scheme of the utility model. (a) Schematic diagram of the six-beam phase-sensitive amplifier process. (b) Four-wave mixing 85 Energy level diagram of the Rb D1 line. Δ, single-photon detuning; δ, two-photon detuning. (c) The interaction structure between the light fields.

[0053] Figure 1 (a) shows the light beam conditions after the probe light, conjugate light, and two pump lights are incident on the rubidium atom cell and four-wave mixing occurs.

[0054] Figure 1 (b) shows the four-wave mixing process 85 Energy level transition structure of Rb D1 spectrum. For single-pump four-wave mixing process, two photons annihilated by the same pump beam are converted into a probe photon and a conjugate photon respectively.

[0055] Figure 1(c) shows the interaction structure of the output beam for the double-pump four-wave mixing process, where the two annihilated photons come from pump light 1 and pump light 2, respectively. The blue solid line represents the single-pump four-wave mixing process, and the gray dashed line represents the double-pump four-wave mixing process. In our scheme, through the single-pump four-wave mixing process, the two photons from pump light 1 are converted into photons in probe light 1 and conjugate light 2 (probe light 2 and conjugate light 1), respectively. The two photons from pump light 2 are converted into photons in probe light 2 and conjugate light 3 (probe light 3 and conjugate light 2), respectively. Through the double-pump four-wave mixing process, the two photons from pump light 1 and pump light 2 are converted into photons in probe light 1 and conjugate light 3 (probe light 2 and conjugate light 2, probe light 3 and conjugate light 1), respectively. There are seven four-wave mixing processes mentioned above.

[0056] Figure 2 This is a detailed experimental layout of the six-beam phase-sensitive amplifier based on the four-wave mixing process of the utility model. 1-Laser, 2-First half-wave plate, 3-First polarization beam splitter, 4-First reflector, 5-Second half-wave plate, 6-Second polarization beam splitter, 7-Third half-wave plate, 8-Second reflector, 9-Third reflector, 10-Fourth reflector, 11-Fourth half-wave plate, 12-Beam splitter, 13-Seventh reflector, 14-First acousto-optic modulator, 15-Second acousto-optic modulator, 16-Fifth reflector, 17-Sixth reflector, 18-Eighth reflector, 19-Piezoelectric ceramics, 20-Glan laser prism, 21-Rubidium atomic cell, 22-Glan-Thompson prism, 23-Beam collector, 24-First photodetector, 25-Second photodetector, 26-Subtractor, 27-Spectrum analyzer, 28-Microcontroller.

[0057] Figure 3 It is the spot pattern in the spot analyzer when the dual pump powers of the phase-sensitive amplifier in the embodiment of the utility model are both 150mW.

[0058] Figure 4 Schematic diagrams comparing the intensity difference compression of the embodiment of the utility model and the existing non-phase-sensitive amplifier. (a) Schematic diagram of the intensity difference compression of the phase-sensitive and non-phase-sensitive amplifiers as the power of pump light 1 changes. (b) Schematic diagram of the intensity difference compression of the phase-sensitive and non-phase-sensitive amplifiers as the power of pump light 2 changes.

[0059] like Figure 4As shown in (a), the blue star curve represents the intensity difference compression of the phase-sensitive amplifier as the power of pump light 1 changes, and the yellow dot curve and the green triangle curve represent the intensity difference compression of the non-phase-sensitive amplifier with only probe light and only conjugate light injected, respectively. When the power of pump light 2 remains unchanged, as the power of pump light 1 increases, the intensity difference compression of the phase-sensitive and non-phase-sensitive amplifiers becomes larger and larger, and the intensity difference compression of the non-phase-sensitive amplifier with only probe light and only conjugate light injected is almost the same. Under the same pump power, the intensity difference compression of the six-beam phase-sensitive amplifier is always better than that of the non-phase-sensitive amplifier, showing obvious compression enhancement. The intensity difference compression in phase-sensitive and non-phase-sensitive cases was also studied by controlling the power of pump light 1 to 150mW and changing the power of pump light 2 gradually from 30mW to 150mW. Figure 4 In (b), the blue star curve represents the intensity difference compression of the phase-sensitive amplifier as the power of the pump light 2 changes, and the yellow dot curve and the green triangle curve represent the intensity difference compression of the non-phase-sensitive amplifier with only the probe light and only the conjugate light injected, respectively. Figure 4 (b) is the same. The intensity difference compression of the phase-sensitive and non-phase-sensitive amplifiers increases with the increase of the power of pump light 2. The intensity difference compression of the non-phase-sensitive amplifier with only probe light and only conjugate light injection remains basically the same. The intensity difference compression of the six-beam phase-sensitive amplifier remains better than that of the non-phase-sensitive amplifier. When the power of pump light 1 and pump light 2 is 150mW, the intensity difference compression of the six-beam phase-sensitive amplifier reaches about 6.64dB, which is about 1.60dB higher than that of the non-phase-sensitive amplifier, which is significantly higher than that of the non-phase-sensitive amplifier.

[0060] The protection content of the present invention is not limited to the above embodiments. Without departing from the spirit and scope of the utility model concept, changes and advantages that can be thought of by those skilled in the art are included in the present invention and are protected by the attached claims.

Claims

1. A six-beam phase-sensitive amplifier based on a four-wave mixing process, characterized in that: The six-beam phase-sensitive amplifier comprises: a laser (1), a plurality of half-wave plates, a plurality of reflectors, a plurality of polarization beam splitters, a beam splitter (12), a plurality of acousto-optic modulators, piezoelectric ceramics (19), a Glan laser prism (20), a rubidium atom pool (21), a Glan-Thompson prism (22), a beam collector (23), a plurality of photodetectors, a subtractor (26), a microcontroller (28) and a spectrum analyzer (27); A first half-wave plate (2) and a first polarization beam splitter (3) are sequentially arranged along the optical path of the laser beam emitted by the laser (1); the first polarization beam splitter (3) splits the laser beam into a first laser beam and a second laser beam; A first reflector (4), a second half-wave plate (5), and a second polarization beam splitter (6) are sequentially arranged along the optical path of the first laser beam; the second polarization beam splitter (6) is used for splitting the first laser beam into a third laser beam and a fourth laser beam; A third half-wave plate (7), a second reflecting mirror (8), and a Glan laser prism (20) are sequentially arranged along the optical path of the third laser beam; One or more reflecting mirrors and a Glan laser prism (20) are sequentially arranged along the optical path of the fourth laser beam; A fourth half-wave plate (11) and a beam splitter (12) are sequentially arranged along the optical path of the second laser beam; the beam splitter (12) splits the second laser beam into a fifth laser beam and a sixth laser beam; A first acousto-optic modulator (14), a reflector group, and a Glan laser prism (20) are sequentially arranged along the optical path of the fifth laser beam; A seventh reflector (13), a second acousto-optic modulator (15), a piezoelectric ceramic (19), an eighth reflector (18), and a Glan laser prism (20) are sequentially arranged along the optical path of the sixth laser beam; The third laser beam, the fourth laser beam, the fifth laser beam and the sixth laser beam are emitted from the Glan laser prism (20) together; a rubidium atom pool (21), a Glan-Thompson prism (22), a plurality of photodetectors, a subtractor (26) and a microcontroller (28) are arranged along the optical path; the spectrum analyzer (27) is arranged after the subtractor (26); and a beam collector (23) is arranged at the reflection position of the Glan-Thompson prism (22).

2. The phase-sensitive amplifier according to claim 1, characterized in that: The laser (1) is a titanium sapphire laser, used for exciting and emitting a laser beam; the first half-wave plate (2) is used for changing the polarization state of the laser beam.

3. The phase-sensitive amplifier according to claim 1, characterized in that: The first reflector (4) is used to change the optical path direction of the first laser beam; the second half-wave plate (5) is used to change the polarization direction of the first laser beam; and / or, The third half-wave plate (7) is used to change the polarization direction of the third laser beam; the second reflector (8) is used to change the optical path direction of the third laser beam; the Glan laser prism (20) is used to combine the beams; and / or, One or more of the reflectors include a third reflector (9) and a fourth reflector (10), which are used to change the optical path direction of the fourth laser beam; and the Glan laser prism (20) is used for beam combining.

4. The phase-sensitive amplifier according to claim 1, characterized in that: The fourth half-wave plate (11) is used to change the polarization direction of the second laser beam; The first acousto-optic modulator (14) performs frequency shift on the fifth laser beam, and after the frequency shift, the fifth laser beam is blue-detuned by 3.04 GHz relative to the pump beam; the reflector group comprises a fifth reflector (16) and a sixth reflector (17), which are used to change the optical path direction of the fifth laser beam; and the Glan laser prism (20) is used to combine the beams; The seventh reflector (13) is used to change the optical path direction of the sixth laser beam; the second acousto-optic modulator (15) performs frequency shift on the sixth laser beam, and after the frequency shift, the sixth laser beam is red-detuned by 3.04 GHz relative to the pump beam; the eighth reflector (18) and the piezoelectric ceramic (19) are used to change the optical path direction of the sixth laser beam; the piezoelectric ceramic (19) is also used to receive the feedback signal of the microcontroller (28); the Glan laser prism (20) is used to combine the beams; The rubidium atom pool (21) is 12 mm long and serves as a medium for a four-wave mixing process; the Glan-Thompson prism (22) is used to filter out residual pump light; the photodetector comprises a first photodetector (24) and a second photodetector (25) for detecting direct current signals and radio frequency signals; the spectrum analyzer (27) is used to analyze radio frequency signals; and the microcontroller (28) is used to calculate and process the direct current signal received by the photodetector, and send the processed output feedback signal to the piezoelectric ceramic (19) in the probe optical path to achieve phase locking control.

5. The six-beam phase-sensitive amplifier according to claim 1, characterized in that: The first polarization beam splitter (3) and the second polarization beam splitter (6) change the beam splitting ratio by rotating the first half-wave plate (2) and the second half-wave plate (5) respectively.

6. The six-beam phase-sensitive amplifier according to claim 1, characterized in that: The rubidium atom pool (21) generates a single pump 85 Four-wave mixing process and dual pumping in Rb double Λ-level structure 85 Rb double Λ-level structure four-wave mixing process.

7. The six-beam phase-sensitive amplifier according to claim 1, characterized in that: The third laser beam and the fourth laser beam are pump light, and the angle between the third laser beam and the fourth laser beam in the vertical plane is 8 mrad; the sixth laser beam is probe light, the fifth laser beam is conjugate light, and the angle between the sixth laser beam and the fifth laser beam in the horizontal plane is 10 mrad.

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