Light quantum gyroscope system and method for improving quantum correlation stability

Abstract

The invention provides a light quantum gyroscope system and method for improving quantum correlation stability. Comprising a first coherent light source, a second coherent light source, a first beam splitter, a wavelength meter, a second beam splitter, a first photoelectric detector, a first polarization beam splitter, a first modulator, a third beam splitter, a second photoelectric detector, a modulator driving module, an integrated control module, an atom ensemble, a second modulator, a first half-wave plate, an optical rotator and a second polarization beam splitter. And a second half-wave plate and an optical fiber ring. Through a frequency and power stability control technology of a light quantum gyroscope system, frequency and power optimization and stability, resonance condition frequency locking and gain consistency power locking of a stable Raman process are realized through closed-loop feedback and cooperative control, atomic resonance condition and gain stability are ensured, the quantum correlation stability of the light quantum gyroscope is improved, and the quality of the light quantum gyroscope is improved. And a reliable technical basis is provided for a light quantum gyroscope system.

Description

Technical Field

[0001] This invention belongs to the field of quantum precision measurement technology, specifically relating to an optical quantum gyroscope system and method for improving quantum correlation stability. Background Technology

[0002] The optical quantum gyroscope system achieves quantized path beam splitting and interference based on the Raman amplification process. Its core is to amplify the angular velocity signal through the quantum correlation between atomic spin waves and the light field. It has high sensitivity, anti-loss, and low noise performance, and is expected to significantly improve the ability of angular velocity measurement and break through the shot noise limit.

[0003] The stability of quantum correlations in the Raman process is crucial for ensuring the accuracy of angular velocity measurements. Environmental changes and light source drift can disrupt atomic resonance conditions and gain stability, introducing classical noise that masks weak quantum signals and affects the quantum correlation stability of the optical quantum gyroscope system. Therefore, it is necessary to design solutions to improve the quantum correlation stability of the system. Summary of the Invention

[0004] This invention proposes an optical quantum gyroscope system and method for improving quantum correlation stability, which can solve the problem of improving the quantum correlation stability of optical quantum gyroscope systems.

[0005] The technical solution of this invention: In a first aspect, this application provides an optical quantum gyroscope system with enhanced quantum correlation stability, comprising: a first coherent light source 1, a second coherent light source 2, a first beam splitter 3, a wavelength meter 4, a second beam splitter 5, a first photodetector 6, a first polarization beam splitter 7, a first modulator 8, a third beam splitter 9, a second photodetector 10, a modulator driving module 11, an integrated control module 12, an atomic ensemble 13, a second modulator 14, a first half-wave plate 15, an optical rotator 16, a second polarization beam splitter 17, a second half-wave plate 18, and an optical fiber ring 19, wherein: The first coherent light source 1 generates pump light P, which is split into a beam by the first beam splitter 3 and enters the wavelength meter 4 for monitoring. The main beam enters the atomic ensemble 13. The second coherent light source 2 generates Raman light R, which is also split into a beam by the wavelength meter 4 for monitoring. The main beam is reflected by the first polarization beam splitter 7, passes through the first modulator 8, and is split by the third beam splitter 9. The split beam enters the second photodetector 10 for monitoring. The main beam enters the atomic ensemble 13. The Raman light R and the signal light S exit from the atomic ensemble 13, pass through the second modulator 14, the first half-wave plate 15, and the optical rotator 16, and are split by the second polarization beam splitter 17. The Raman light R is split at the second polarization beam splitter 17. The reflected light enters the fiber loop 19, exits through the second half-wave plate 18, and is transmitted through the second polarization beam splitter 17. The original signal light S is transmitted through the second polarization beam splitter 17, passes through the second half-wave plate 18, enters the fiber loop 19, exits through the second polarization beam splitter 17, and is reflected back. Finally, it enters the first photodetector 6. The second photodetector 10 and the modulator drive module 11 are connected by a signal line. The first modulator 8 and the modulator drive module 11 are connected by a signal line. The modulator drive module 11 and the integrated control module 12 are connected by a signal line. The wavelength meter 4 and the integrated control module 12 are connected by a signal line.

[0006] Specifically, the first coherent light source 1 is used to generate pump light P, which polarizes atomic spins. This light field is required to resonate with the atomic transition energy levels and operate in continuous mode. The second coherent light source 2 is used to generate incident Raman light R, which is coupled with atomic spin waves. This light field is required to be detuned to the atomic transition energy levels and operate in continuous mode.

[0007] Specifically, the first beam splitter 3 is used to split the pump light P, with 10% of the branch used for frequency monitoring by the wavelength meter 4 and 90% of the branch incident on the atomic ensemble 13; the second beam splitter 5 is used to split the Raman light R, with 10% of the branch used for frequency monitoring by the wavelength meter 4 and 90% of the branch reflected by the first polarization beam splitter 7; the third beam splitter 9 is used to split the Raman light R, with 10% of the branch used for power monitoring by the second photodetector 10 and 90% of the branch incident on the atomic ensemble 13.

[0008] Specifically, a photodetector 6 is used to measure the interference signal light S, and a second photodetector 10 is used to detect the power of the Raman light R; a first polarization beam splitter 7 is used to separate the horizontal and vertical polarizations of the Raman light R, and a second polarization beam splitter 17 is used to separate the Raman light R and the signal light S; a first modulator 8 is used to stabilize the power of the Raman light R; and a second modulator 14 is used to apply phase modulation to the signal light S and the Raman light R, changing the refractive index difference between the fast axis and the slow axis under the drive of an external voltage to generate a phase difference, thereby achieving phase shifting of the interference signal.

[0009] Secondly, this application provides a method for improving the stability of an optical quantum gyroscope with enhanced quantum correlation, comprising the following steps: Step 1: The first coherent light source 1 generates pump light P, which is split and enters the atomic ensemble 13 and wavelength meter 4. The second coherent light source 2 generates Raman light R, which is split and enters the wavelength meter 4, the second photodetector 10, and the atomic ensemble 13. Step 2: Pump light P and Raman light R perform Raman scattering, generating signal light S and atomic spin wave A. Signal light S and Raman light R are injected into fiber loop 19 and then emitted back into atomic ensemble 13. Signal light S is detected by the first photodetector 6. Step 3: Lock the frequencies of pump light P and Raman light R using wavelength meter 4, integrated control module 12, first coherent light source 1, and second coherent light source 2. Step 4: Lock the power of the Raman light R through the second photodetector 10, the first modulator 8, and the modulator drive module 11. Step 5: The integrated control module 12 processes the signal, generates control commands, locks in frequency and power, and improves the stability of quantum correlation.

[0010] Specifically, step 1 includes: Step 11: The first coherent light source 1 generates pump light P, which passes through the first beam splitter 3 with a splitting ratio of 1:9. 90% of the pump light P is incident on the atomic ensemble 13, polarizing the atomic spins and preparing the initial atomic state. 10% of the pump light P enters the wavelength meter 4 to monitor the frequency of the pump light P in real time. Step 12: The second coherent light source 2 generates Raman light R, which passes through the second beam splitter 5 with a splitting ratio of 1:9. 10% of the Raman light R enters the wavelength meter 4 to monitor the frequency of the Raman light R in real time, and 90% of the Raman light R passes through the first polarization beam splitter 7 and then through the first modulator 8 to lock the power of the Raman light R. Step 13: The Raman light R passes through the third beam splitter 9 with a splitting ratio of 1:9. 10% of the light enters the second photodetector 10 to monitor the power of the Raman light R; 90% of the light enters the atomic ensemble 13 to undergo the Raman scattering process.

[0011] Specifically, step 2 includes: Step 21: Under the combined action of pump light P and Raman light R, atomic ensemble 13 realizes the Raman scattering process, generating signal light S and atomic spin wave A. Step 22: The atomic spin wave A remains in the atomic ensemble 13, and the signal light S and Raman light R are injected into the clockwise and counterclockwise paths of the fiber ring 19, respectively, and propagate in the reverse direction in the fiber ring 19. Step 23: The signal light S and Raman light R exit the fiber loop 19 into the atomic ensemble 13, where they are spatially combined with the atomic spin wave A, resulting in stimulated Raman scattering. The signal light S and the atomic spin wave A are enhanced and amplified by quantum correlation, and phase-sensitive interference occurs. Step 24: The generated final output horizontally polarized signal light propagates from the atomic ensemble 13 and enters the first photodetector 6.

[0012] Specifically, step 3 includes: Step 31: Calibrate the initial frequencies of the pump light P and Raman light R using wavelength meter 4, and monitor the frequencies of the pump light P and Raman light R in real time. Input the deviation between the measured frequency values ​​and the target values ​​into the integrated control module 12 in real time. Step 32: The wavelength meter 4 has a built-in PID controller that dynamically adjusts the drive signal based on the output, and dynamically adjusts the drive current of the first coherent light source 1 and the second coherent light source 2 to compensate for slow drift caused by temperature changes and maintain the stability of the quantum correlation of the photonic quantum gyroscope. Step 33: Using the signal light power as an indirect feedback signal for the Raman resonance state, the Raman resonance state is indirectly determined by detecting the power change of the signal light through the first photodetector 6, thereby improving the frequency locking accuracy.

[0013] Specifically, step 4 includes: Step 41: In the Raman optical path, the optical power is monitored in real time by the second photodetector 10. The detection signal is input to the modulator driver module 11. Based on the power feedback signal, the radio frequency power of the first modulator 8 is adjusted to change the diffraction efficiency and stabilize the output power. Step 42: Compensate for the power drift of the light source by adjusting the DC component of the light source drive current.

[0014] Specifically, step 5 includes: Step 51: Integrate the locking frequency and locking power modules onto the same control board to obtain the integrated control module 12; Step 52: The integrated control module 12 receives frequency and power error signals, integrates a high-speed ADC / DAC and a multi-threaded PID algorithm, and optimizes feedback parameters through a digital signal processor to improve quantum correlation stability. Step 53: The digital signal processor receives real-time data from the wavelength meter 4 and the second photodetector 10, calculates the frequency deviation and power deviation, and generates a light source temperature and current adjustment command and a modulator radio frequency signal. Step 54: Run the collaborative control algorithm and analyze the correlation between the two factors. For example, if temperature drift simultaneously affects frequency and power, establish a pre-compensation model and analyze the correlation between temperature, vibration, and frequency / power drift using historical data. Step 55: Perform priority scheduling, prioritize frequency locking in high-noise environments to ensure Raman resonance conditions; optimize power equalization in stable environments.

[0015] The beneficial effects of this invention are: This invention proposes an optical quantum gyroscope system and method for improving quantum correlation stability. The performance of optical quantum gyroscope systems is susceptible to the influence of the frequency and power of the pump light and Raman light. Specifically: 1. Frequency deviations in the pump light and Raman light reduce Raman efficiency, thereby disrupting quantum correlation and lowering the signal-to-noise ratio. 2. Unstable Raman light power disrupts Raman gain consistency, affecting the stability of quantum correlation. The control system and scheme proposed in this invention, through frequency and power stabilization control technology of the optical quantum gyroscope system, achieves frequency and power optimization and stabilization through closed-loop feedback and cooperative control. It stabilizes the resonance conditions of the Raman process, frequency locking, and gain consistency power locking, ensuring atomic resonance conditions and gain stability, thus improving the stability of quantum correlation in the optical quantum gyroscope and providing a reliable technical foundation for optical quantum gyroscope systems. It can be applied to fields with stringent requirements for long-term system stability, such as high-precision inertial navigation, quantum sensing, and aerospace precision measurement. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 This is an overall architecture diagram of the optical quantum gyroscope system with improved quantum correlation stability in the embodiments of the invention.

[0018] Figure 2 This is a flowchart of the optical quantum gyroscope method for improving quantum correlation stability in an embodiment of the invention.

[0019] Figure 3 The working medium in the embodiments of the invention 87 Rb atom energy levels and corresponding optical frequency diagrams.

[0020] Figure 4 The working medium in the embodiments of the invention 133 Cs atomic energy levels and corresponding optical frequency diagrams.

[0021] The components in the diagram are represented by numbers: 1 First coherent light source, 2 Second coherent light source, 3 First beam splitter, 4 Wavelength meter, 5 Second beam splitter, 6 First photodetector, 7 First polarization beam splitter, 8 First modulator, 9 Third beam splitter, 10 Second photodetector, 11 Modulator driver module, 12 Integrated control module, 13 Atomic ensemble, 14 Second modulator, 15 First half-wave plate, 16 Optical rotator, 17 Second polarization beam splitter, 18 Second half-wave plate, 19 Fiber optic ring. Detailed Implementation

[0022] The invention will be further described in detail below with reference to the specific embodiments and accompanying drawings. Except for the contents specifically mentioned below, the processes, conditions, and experimental methods for implementing the invention are all common knowledge and general knowledge in the art, and the invention does not have any particular limitations.

[0023] Example 1 like Figure 1 As shown, this invention proposes an optical quantum gyroscope system with enhanced quantum correlation stability, comprising: a first coherent light source 1, a second coherent light source 2, a first beam splitter 3, a wavelength meter 4, a second beam splitter 5, a first photodetector 6, a first polarization beam splitter 7, a first modulator 8, a third beam splitter 9, a second photodetector 10, a modulator drive module 11, an integrated control module 12, an atomic ensemble 13, a second modulator 14, a first half-wave plate 15, an optical rotator 16, a second polarization beam splitter 17, a second half-wave plate 18, and an optical fiber ring 19, wherein: The first coherent light source 1 generates pump light P, which is split into a beam by the first beam splitter 3 and enters the wavelength meter 4 for monitoring. The main beam enters the atomic ensemble 13. The second coherent light source 2 generates Raman light R, which is split into a beam by the wavelength meter 4 for monitoring. The main beam is reflected by the first polarization beam splitter 7, passes through the first modulator 8, and is split by the third beam splitter 9. One beam is then entered by the second photodetector 10 for monitoring, and the main beam enters the atomic ensemble 13. The Raman light R and the signal light S exit from the atomic ensemble 13, pass through the second modulator 14, the first half-wave plate 15, and the optical rotator 16, and are split by the second polarization beam splitter 17. The Raman light R is reflected at the second polarization beam splitter 17, enters the fiber loop 19, exits, passes through the second half-wave plate 18, and is transmitted back along the original path at the second polarization beam splitter 17. The signal light S is transmitted through the second polarization beam splitter 17, passes through the second half-wave plate 18, enters the fiber loop 19, and after exiting, is reflected back at the second polarization beam splitter 17, finally entering the first photodetector 6. The second photodetector 10 and the modulator drive module 11 are connected by signal lines, the first modulator 8 and the modulator drive module 11 are connected by signal lines, the modulator drive module 11 and the integrated control module 12 are connected by signal lines, and the wavelength meter 4 and the integrated control module 12 are connected by signal lines.

[0024] Specifically, the first coherent light source 1 is used to generate pump light P, which polarizes atomic spins. This light field is required to resonate with the atomic transition energy levels and operate in continuous mode. The second coherent light source 2 is used to generate incident Raman light R, which is coupled to atomic spin waves. This light field is required to be detuned to the atomic transition energy levels and operate in continuous mode.

[0025] Specifically, the first beam splitter 3 splits the pump light P, with 10% of the branch used for frequency monitoring by the wavelength meter 4, and the remaining 90% of the branch incident on the atomic ensemble 13. The second beam splitter 5 splits the Raman light R, with 10% of the branch used for frequency monitoring by the wavelength meter 4, and the remaining 90% of the branch reflected by the first polarization beam splitter 7. The third beam splitter 9 splits the Raman light R, with 10% of the branch used for power monitoring by the second photodetector 10, and the remaining 90% of the branch incident on the atomic ensemble 13.

[0026] The splitting ratio of the first beam splitter 3, the second beam splitter 5, and the third beam splitter 9 is 1:9.

[0027] Specifically, wavelength meter 4 is used to detect the frequencies of pump light P and Raman light R.

[0028] Specifically, the first photodetector 6 is used to measure the interference signal light S, and the second photodetector 10 is used to detect the power of the Raman light R.

[0029] Specifically, the first polarization beam splitter 7 is used to separate the horizontal and vertical polarizations of the Raman light R, and the second polarization beam splitter 17 is used to separate the Raman light R and the signal light S.

[0030] Specifically, the first modulator 8 is used to stabilize the power of the Raman light R. The second modulator 14 is used to apply phase modulation to the signal light S and the Raman light R, and under the drive of an external voltage, changes the refractive index difference between the fast axis and the slow axis to generate a phase difference, thereby achieving phase shifting of the interference signal.

[0031] The first modulator 8 includes an acousto-optic modulator. The second modulator 14 includes an electro-optic modulator.

[0032] Specifically, the modulator driver module 11 is used to drive the first modulator 8 and adjust the radio frequency drive signal of the first modulator 8 in real time.

[0033] Specifically, the atomic ensemble 13 is used to generate quantum-correlated signal light and atomic spin waves through Raman scattering under the action of pump light P and Raman light R.

[0034] Specifically, the first half-wave plate 15 and the second half-wave plate 18 are used to change the polarization direction of the Raman light R and the signal light S.

[0035] Specifically, the optical rotator 16 is used to change the polarization direction of the Raman light R and the signal light S. It is used in conjunction with the half-wave plate to utilize the Faraday rotation effect so that the polarization direction of the light passing through the optical rotator 16 and the half-wave plate in the forward direction remains unchanged, while the polarization direction of the light passing through in the reverse direction is rotated by 90 degrees.

[0036] Specifically, fiber ring 19 is made of polarization-maintaining fiber to enhance the Sagnac effect. When the gyroscope is subjected to angular velocity, the two optical signal beams and Raman beams propagating in the clockwise and counterclockwise directions in fiber ring 19 will obtain phase modulation introduced by the angular velocity.

[0037] Specifically, the integrated control module 12 is used to integrate the frequency locking and power locking modules on the same control board, receive frequency and power error signals, integrate high-speed ADC / DAC and multi-threaded PID algorithm, and improve quantum correlation stability by coordinating and optimizing feedback parameters through digital signal processor.

[0038] In summary, this invention provides an optical quantum gyroscope system with enhanced quantum correlation stability. By locking the frequency and power of the light source through frequency and power unit modulation, the Raman process is stabilized. Joint frequency and power optimization is achieved through dynamic modulation and closed-loop feedback, ensuring long-term stability of quantum correlation and providing a reliable technical foundation for optical quantum gyroscope systems.

[0039] Example 2 like Figure 2 As shown, this invention provides a method for improving the stability of an optical quantum gyroscope with enhanced quantum correlation, comprising the following steps: Step 1: The first coherent light source 1 generates pump light P, which is split and enters the atomic ensemble 13 and the wavelength meter 4. The second coherent light source 2 generates Raman light R, which is split and enters the wavelength meter 4, the second photodetector 10, and the atomic ensemble 13.

[0040] Specifically, step 1 includes: Step 11: The first coherent light source 1 generates pump light P, which passes through the first beam splitter 3 with a splitting ratio of 1:9. 90% of the pump light P is incident on the atomic ensemble 13, polarizing the atomic spin and preparing the initial state of the atom. 10% of the pump light P enters the wavelength meter 4 to monitor the frequency of the pump light P in real time.

[0041] Step 12: The second coherent light source 2 generates Raman light R, which passes through the second beam splitter 5 with a splitting ratio of 1:9. 10% of the Raman light R enters the wavelength meter 4 to monitor the frequency of the Raman light R in real time. 90% of the Raman light R passes through the first polarization beam splitter 7 and then through the first modulator 8 to lock the power of the Raman light R.

[0042] Step 13: The Raman light R passes through the third beam splitter 9 with a splitting ratio of 1:9. 10% of the light enters the second photodetector 10 to monitor the power of the Raman light R; 90% of the light enters the atomic ensemble 13 to undergo the Raman scattering process.

[0043] Step 2: Pump light P and Raman light R perform Raman scattering, generating signal light S and atomic spin wave A. Signal light S and Raman light R are injected into fiber loop 19 and then emitted back into atomic ensemble 13. Signal light S is detected by the first photodetector 6.

[0044] Specifically, step 2 includes: Step 21: Under the combined action of pump light P and Raman light R, atomic ensemble 13 realizes the Raman scattering process, generating signal light S and atomic spin wave A.

[0045] The signal light S forms a quantum correlation with the atomic spin wave A. The polarization state of the signal light S is perpendicular to that of the Raman light R.

[0046] Step 22: The atomic spin wave A remains in the atomic ensemble 13, and the signal light S and Raman light R are injected into the clockwise and counterclockwise paths of the fiber ring 19, respectively, and propagate in the reverse direction in the fiber ring 19.

[0047] When an optical fiber is placed on a rotating platform and rotated, the phase information resulting from the rotation will be coupled into the optical field.

[0048] Step 23: The signal light S and Raman light R are emitted from the fiber loop 19 into the atomic ensemble 13, where they are spatially combined with the atomic spin wave A, resulting in stimulated Raman scattering. The signal light S and the atomic spin wave A are amplified by quantum correlation and undergo phase-sensitive interference.

[0049] Step 24: The generated final output horizontally polarized signal light propagates from the atomic ensemble 13 and enters the first photodetector 6.

[0050] By analyzing the interference signal, the relationship between the platform's rotational angular velocity and the signal strength can be extracted, thereby enabling the measurement of the angular velocity.

[0051] Step 3: Lock the frequencies of pump light P and Raman light R using wavelength meter 4, integrated control module 12, first coherent light source 1 and second coherent light source 2.

[0052] Specifically, step 3 includes: Step 31: Calibrate the initial frequencies of pump light P and Raman light R using wavelength meter 4, and monitor the frequencies of pump light P and Raman light R in real time. Input the deviation between the frequency measurement value and the target value into the integrated control module 12 in real time.

[0053] In an optical quantum gyroscope system, the frequencies of the pump light P and the Raman light R affect Raman efficiency and disrupt atomic resonance conditions. Frequency detuning also introduces additional phase noise, reducing the signal-to-noise ratio of the interference signal. To ensure that the frequency of the pump light P matches the frequency required for atomic ground-state polarization, the frequency of the Raman light R must be locked to the atomic transition frequency.

[0054] Step 32: The wavelength meter 4 has a built-in PID controller that dynamically adjusts the drive signal according to the output, and dynamically adjusts the drive current of the first coherent light source 1 and the second coherent light source 2 to compensate for slow drift caused by temperature changes and maintain the stability of the quantum correlation of the photonic quantum gyroscope.

[0055] Step 33: The signal light power can be used as an indirect feedback signal for the Raman resonance state. The Raman resonance state can be indirectly determined by detecting the power change of the signal light through the first photodetector 6, thereby improving the frequency locking accuracy.

[0056] Step 4: Lock the power of the Raman light R through the second photodetector 10, the first modulator 8 and the modulator drive module 11.

[0057] Specifically, step 4 includes: Step 41: In the Raman optical path, the optical power is monitored in real time by the second photodetector 10. The detection signal is input to the modulator drive module 11. According to the power feedback signal, the radio frequency power of the first modulator 8 is adjusted to change the diffraction efficiency to stabilize the output power.

[0058] Step 42: Compensate for the power drift of the light source by adjusting the DC component of the light source drive current.

[0059] In an optical quantum gyroscope system, the Raman amplification efficiency is directly related to the power of the Raman beam R. The power of the Raman beam R directly determines the strength of the quantum correlation signal, and fluctuations in its power can lead to instability in the quantum correlation state. Simultaneously, the power of the Raman beam R also determines the backscattering noise in the fiber loop 19, affecting the noise level of the quantum correlation signal and thus influencing the quantum signal.

[0060] Step 5: The integrated control module 12 processes the signal, generates control commands, locks in frequency and power, and improves the stability of quantum correlation.

[0061] Specifically, step 5 includes: Step 51: Integrate the locking frequency and locking power modules onto the same control board to obtain the integrated control module 12.

[0062] Step 52: The integrated control module 12 receives frequency and power error signals, integrates a high-speed ADC / DAC and a multi-threaded PID algorithm, and optimizes feedback parameters through a digital signal processor to improve quantum correlation stability.

[0063] Step 53: The digital signal processor receives real-time data from the wavelength meter 4 and the second photodetector 10, calculates the frequency deviation and power deviation, and generates a light source temperature and current adjustment command and a modulator radio frequency signal.

[0064] Step 54: Run the collaborative control algorithm to analyze the correlation between the two factors, such as how temperature drift affects both frequency and power. Establish a pre-compensation model and analyze the correlation between temperature, vibration, and frequency / power drift using historical data.

[0065] Step 55: Perform priority scheduling, prioritize frequency locking in high-noise environments to ensure Raman resonance conditions; optimize power equalization in stable environments, etc.

[0066] In this invention, the interaction medium unit of the atomic ensemble 13 can be an atom, ion, molecule, or quantum dot in its ground state.

[0067] The innovative aspects of this invention: 1. Improved quantum correlation stability: Design a control architecture for the optical quantum gyroscope system, stabilize the resonant condition frequency locking and gain consistency power locking of the Raman process, improve the quantum correlation amplification stability of the optical quantum gyroscope, and thus improve the angular velocity measurement performance of the optical quantum gyroscope.

[0068] 2. Closed-loop frequency locking mechanism: The frequency of the light source is monitored in real time by a wavelength meter, and frequency detuning is dynamically compensated to ensure the frequency stability of the pump light and Raman light, maintain the Raman resonance condition, ensure quantum correlation, and improve the signal-to-noise ratio.

[0069] 3. Dynamic power equalization: By adjusting the power of Raman light, the fluctuation of Raman light power is suppressed, the stability of Raman gain is maintained, and thus the stability of the optical quantum gyroscope system is improved.

[0070] 4. Collaborative control architecture: An integrated digital platform enables collaborative optimization of frequency and power, improving the stability of quantum correlations.

[0071] Example 3 This embodiment uses ensemble 13 as the basis for preparing pure atoms in the ground state. 87 The method will be illustrated using the Rb atom ensemble as an example. The method includes the following steps: Step 1: The first coherent light source 1 generates a pump light P, which is split into the atomic ensemble 13 and the wavelength meter 4, respectively, for preparing the atomic initial state and monitoring the frequency of the pump light P.

[0072] Specifically, step 1 includes: Step 11: The first coherent light source 1 generates pump light P with a wavelength of 780nm, corresponding to the D2 line of Rb atoms, which passes through the first beam splitter 3 with a splitting ratio of 1:9.

[0073] Step 12: 90% of the pump light P is incident on the atomic ensemble 13, polarizing the atomic spin and preparing the initial state of the atom.

[0074] Step 13: 10% of the pump light P enters the wavelength meter 4 to monitor the frequency of the pump light P in real time.

[0075] In a quantum optical gyroscope, the initial atomic states should be prepared first, and all the initial states of the atomic ensemble 13 should be distributed in the 5th position. 2 S 1 / 2 F = 1, ground state energy level, or 5 2 S 1 / 2 At the ground state energy level F=2, we will take F=1 as an example for explanation.

[0076] in, Figure 3 What is displayed is 87 Rb atom energy levels and corresponding optical frequency diagrams. Among them, 5 2 S 1 / 2 5 2 P 1 / 2 5 2 P 3 / 2 for 87 The fine structure of Rb atoms, F=1 and F=2 are fine structures. 2 S 1 / 2 The hyperfine splitting has an energy level difference of 6.83 GHz, and the dashed lines represent virtual energy levels.

[0077] Step 2: The second coherent light source 2 generates Raman light R, which is split into a wavelength meter 4, a second photodetector 10, and an atomic ensemble 13, and used for frequency monitoring, power monitoring, and Raman scattering process of the Raman light R, respectively.

[0078] Specifically, step 2 includes: Step 21: The second coherent light source 2 generates Raman light R with a wavelength of 795nm, corresponding to the D1 line of Rb atoms. After passing through the second beam splitter 5 with a splitting ratio of 1:9, 10% of the Raman light R enters the wavelength meter 4 to monitor the frequency of the Raman light R in real time.

[0079] Step 22: 90% of the Raman light R passes through the first polarization beam splitter 7 and then through the first modulator 8. The first modulator 8 is used to lock the power of the Raman light R.

[0080] Step 23: The remaining Raman light R passes through the third beam splitter 9 with a splitting ratio of 1:9. 10% of the light enters the second photodetector 10 to monitor the power of the Raman light R; 90% of the light enters the atomic ensemble 13 to undergo the Raman scattering process.

[0081] Step 3: Under the combined action of pump light P and Raman light R, atomic ensemble 13 realizes the Raman scattering process, generating signal light S and atomic spin wave A.

[0082] The signal light S forms a quantum correlation with the atomic spin wave A. The signal light S and the Raman light R have a fixed frequency difference of 6.83 GHz.

[0083] In this case, the signal light S is perpendicular to the polarization state of the Raman light R. Taking the vertically polarized Raman light as an example, the generated signal light is horizontally polarized.

[0084] Step 4: Inject the signal light S and the Raman light R into the fiber ring 19 respectively.

[0085] Specifically, step 4 includes: Step 41: The atomic spin wave A remains in the atomic ensemble 13, and the signal light S is emitted together with the Raman light R, leaving the atomic ensemble 13 and entering the second modulator 14.

[0086] Step 42: After passing through the first half-wave plate 15 and the optical rotator 16, the polarization state remains unchanged. After passing through the second polarization beam splitter 17, the signal light S and the Raman light R are spatially separated.

[0087] Step 43: The second half-wave plate 18 is used to change the polarization state of the light field. The horizontally polarized signal light becomes vertically polarized after passing through the second half-wave plate 18.

[0088] Step 44: The signal light S and the Raman light R are injected into the clockwise and counterclockwise paths of the fiber ring 19, respectively, and their polarization states are consistent and they propagate in opposite directions in the fiber ring 19.

[0089] When the fiber ring 19 is placed on a rotating platform and rotated, the phase information brought about by the rotation will be coupled into the optical field.

[0090] Step 5: The signal light S and Raman light R exit the fiber loop 19 and return to the atomic ensemble 13. The signal light S is detected by the first photodetector 6.

[0091] Specifically, step 5 includes: Step 51: The signal light S and Raman light R are emitted from the fiber ring 19. The vertically polarized Raman light R becomes horizontally polarized after passing through the second half-wave plate 18 and then passes through the second polarization beam splitter 17.

[0092] Step 52: The polarization states of the two beams of light are exchanged after passing through the first half-wave plate 15 and the optical rotator 16.

[0093] Step 53: Return to the atomic ensemble 13, and combine with the atomic spin wave A in space. Stimulated Raman scattering occurs, and the signal light S and the atomic spin wave A generate quantum correlation enhancement and amplification, and phase-sensitive interference occurs.

[0094] Step 54: The generated final output horizontally polarized signal light propagates from the atomic ensemble 13, passes through the first polarization beam splitter 7, is detected by the first photodetector 6, and the vertically polarized Raman light R returns along the original path.

[0095] By analyzing the interference signal, the relationship between the platform's rotational angular velocity and the signal strength can be extracted, thereby enabling the measurement of the angular velocity.

[0096] Step 6: Lock the frequencies of pump light P and Raman light R using wavelength meter 4, integrated control module 12, first coherent light source 1 and second coherent light source 2.

[0097] Specifically, step 6 includes: Step 61: Calibrate the initial frequencies of pump light P and Raman light R using wavelength meter 4, and monitor the frequencies of pump light P and Raman light R in real time. Input the deviation between the frequency measurement value and the target value into the integrated control module 12 in real time.

[0098] In an optical quantum gyroscope system, the frequencies of the pump light P and the Raman light R affect Raman efficiency and disrupt atomic resonance conditions. Frequency detuning also introduces additional phase noise, reducing the signal-to-noise ratio of the interference signal. To ensure that the frequency of the pump light P matches the frequency required for atomic ground-state polarization, the frequency of the Raman light R must be locked to the atomic transition frequency.

[0099] Step 62: The wavelength meter 4 has a built-in PID controller that dynamically adjusts the drive signal according to the output, and dynamically adjusts the drive current of the first coherent light source 1 and the second coherent light source 2 to compensate for slow drift caused by temperature changes and maintain the stability of the quantum correlation of the photonic quantum gyroscope.

[0100] Step 63: The signal light power can be used as an indirect feedback signal for the Raman resonance state. The Raman resonance state can be indirectly determined by detecting the power change of the signal light through the first photodetector 6, thereby improving the frequency locking accuracy.

[0101] Step 7: Lock the power of the Raman light R through the second photodetector 10, the first modulator 8 and the modulator drive module 11.

[0102] Specifically, step 7 includes: Step 71: In the Raman optical path, the optical power is monitored in real time by the second photodetector 10. The detection signal is input to the modulator drive module 11. According to the power feedback signal, the radio frequency power of the first modulator 8 is adjusted to change the diffraction efficiency to stabilize the output power.

[0103] Step 72: Compensate for the power drift of the light source by adjusting the DC component of the light source drive current.

[0104] In an optical quantum gyroscope system, the Raman amplification efficiency is directly related to the power of the Raman beam R. The power of the Raman beam R directly determines the strength of the quantum correlation signal, and fluctuations in its power can lead to instability in the quantum correlation state. Simultaneously, the power of the Raman beam R also determines the backscattering noise in the fiber loop 19, affecting the noise level of the quantum correlation signal and thus influencing the quantum signal.

[0105] Step 8: The integrated control module 12 processes the signal and generates control commands to lock the frequency and power, thereby improving the stability of quantum correlation.

[0106] Specifically, step 8 includes: Step 81: Integrate the locking frequency and locking power modules onto the same control board to obtain the integrated control module 12.

[0107] Step 82: The integrated control module 12 receives frequency and power error signals, integrates a high-speed ADC / DAC and a multi-threaded PID algorithm, and optimizes feedback parameters through a digital signal processor to improve quantum correlation stability.

[0108] Step 83: The digital signal processor receives real-time data from the wavelength meter 4 and the second photodetector 10, calculates the frequency deviation and power deviation, and generates a light source temperature and current adjustment command and a modulator radio frequency signal.

[0109] Step 84: Run the collaborative control algorithm to analyze the correlation between the two factors, such as how temperature drift affects both frequency and power. Establish a pre-compensation model and analyze the correlation between temperature, vibration, and frequency / power drift using historical data.

[0110] Step 85: Perform priority scheduling, prioritize frequency locking in high-noise environments to ensure Raman resonance conditions; optimize power equalization in stable environments, etc.

[0111] Example 4 This embodiment uses ensemble 13 as the basis for preparing pure atoms in the ground state. 133 This method will be illustrated using the Cs atom ensemble as an example. The steps include: Step 1: The first coherent light source 1 generates a pump light P, which is split into the atomic ensemble 13 and the wavelength meter 4, respectively, for preparing the atomic initial state and monitoring the frequency of the pump light P.

[0112] Specifically, step 1 includes: Step 11: The first coherent light source 1 generates pump light P with a wavelength of 894nm, corresponding to the D2 line of Cs atoms, which passes through the first beam splitter 3 with a splitting ratio of 1:9.

[0113] Step 12: 90% of the pump light P is incident on the atomic ensemble 13, polarizing the atomic spin and preparing the initial state of the atom.

[0114] Step 13: 10% of the pump light P enters the wavelength meter 4 to monitor the frequency of the pump light P in real time.

[0115] In a quantum optical gyroscope, the initial atomic states should be prepared first, and all the initial states of the atomic ensemble 13 should be distributed in position 6. 2 S 1 / 2F = 3, ground state energy level, or 6 2 S 1 / 2 At the ground state energy level of F=4, we will take F=3 as an example for explanation.

[0116] in, Figure 4 What is displayed is 133 Cs atomic energy levels and corresponding optical frequency diagrams. Among them, 6 2 S 1 / 2 6 2 P 1 / 2 6 2 P 3 / 2 for 133 The fine structure of Cs atoms, F=3 and F=4 are fine structures. 2 S 1 / 2 The hyperfine splitting has an energy level difference of 9.19 GHz, and the dashed lines represent virtual energy levels.

[0117] Step 2: The second coherent light source 2 generates Raman light R, which is split into a wavelength meter 4, a second photodetector 10, and an atomic ensemble 13, and used for frequency monitoring, power monitoring, and Raman scattering process of the Raman light R, respectively.

[0118] Specifically, step 2 includes: Step 21: The second coherent light source 2 generates Raman light R with a wavelength of 852nm, corresponding to the D1 line of Cs atoms. After passing through the second beam splitter 5 with a splitting ratio of 1:9, 10% of the Raman light R enters the wavelength meter 4 to monitor the frequency of the Raman light in real time.

[0119] Step 22: 90% of the Raman light R passes through the first polarization beam splitter 7 and then through the first modulator 8. The first modulator 8 is used to lock the power of the Raman light R.

[0120] Step 23: The remaining Raman light R passes through the third beam splitter 9 with a splitting ratio of 1:9. 10% of the light enters the second photodetector 10 to monitor the power of the Raman light R; 90% of the light enters the atomic ensemble 13 to undergo the Raman scattering process.

[0121] Step 3: Under the combined action of pump light P and Raman light R, atomic ensemble 13 realizes the Raman scattering process, generating signal light S and atomic spin wave A.

[0122] The signal light S forms a quantum correlation with the atomic spin wave A. The signal light S and the Raman light R have a fixed frequency difference of 9.19 GHz.

[0123] In this case, the signal light S is perpendicular to the polarization state of the Raman light R. Taking the vertically polarized Raman light as an example, the generated signal light is horizontally polarized.

[0124] Step 4: Inject the signal light S and the Raman light R into the fiber ring 19 respectively.

[0125] Specifically, step 4 includes: Step 41: The atomic spin wave A remains in the atomic ensemble 13, and the signal light S is emitted together with the Raman light R, leaving the atomic ensemble 13 and entering the second modulator 14.

[0126] Step 42: After passing through the first half-wave plate 15 and the optical rotator 16, the polarization state remains unchanged. After passing through the second polarization beam splitter 17, the signal light S and the Raman light R are spatially separated.

[0127] Step 43: The second half-wave plate 18 is used to change the polarization state of the light field. The horizontally polarized signal light becomes vertically polarized after passing through the second half-wave plate 18.

[0128] Step 44: The signal light S and the Raman light R are injected into the clockwise and counterclockwise paths of the fiber ring 19, respectively, and their polarization states are consistent and they propagate in opposite directions in the fiber ring 19.

[0129] When the fiber ring 19 is placed on a rotating platform and rotated, the phase information brought about by the rotation will be coupled into the optical field.

[0130] Step 5: The signal light S and Raman light R exit the fiber loop 19 and return to the atomic ensemble 13. The signal light S is detected by the first photodetector 6.

[0131] Specifically, step 5 includes: Step 51: The signal light S and Raman light R are emitted from the fiber ring 19. The vertically polarized Raman light R becomes horizontally polarized after passing through the second half-wave plate 18 and then passes through the second polarization beam splitter 17.

[0132] Step 52: The polarization states of the two beams of light are exchanged after passing through the first half-wave plate 15 and the optical rotator 16.

[0133] Step 53: Return to the atomic ensemble 13, and combine with the atomic spin wave A in space. Stimulated Raman scattering occurs, and the signal light S and the atomic spin wave A generate quantum correlation enhancement and amplification, and phase-sensitive interference occurs.

[0134] Step 54: The generated final output horizontally polarized signal light propagates from the atomic ensemble 13, passes through the first polarization beam splitter 7, is detected by the first photodetector 6, and the vertically polarized Raman light R returns along the original path.

[0135] By analyzing the interference signal, the relationship between the platform's rotational angular velocity and the signal strength can be extracted, thereby enabling the measurement of the angular velocity.

[0136] Step 6: Lock the frequencies of pump light P and Raman light R using wavelength meter 4, integrated control module 12, first coherent light source 1 and second coherent light source 2.

[0137] Specifically, step 6 includes: Step 61: Calibrate the initial frequencies of pump light P and Raman light R using wavelength meter 4, and monitor the frequencies of pump light P and Raman light R in real time. Input the deviation between the frequency measurement value and the target value into the integrated control module 12 in real time.

[0138] In an optical quantum gyroscope system, the frequencies of the pump light P and the Raman light R affect Raman efficiency and disrupt atomic resonance conditions. Frequency detuning also introduces additional phase noise, reducing the signal-to-noise ratio of the interference signal. To ensure that the frequency of the pump light P matches the frequency required for atomic ground-state polarization, the frequency of the Raman light R must be locked to the atomic transition frequency.

[0139] Step 62: The wavelength meter 4 has a built-in PID controller that dynamically adjusts the drive signal according to the output, and dynamically adjusts the drive current of the first coherent light source 1 and the second coherent light source 2 to compensate for slow drift caused by temperature changes and maintain the stability of the quantum correlation of the photonic quantum gyroscope.

[0140] Step 63: The signal light power can be used as an indirect feedback signal for the Raman resonance state. The Raman resonance state can be indirectly determined by detecting the power change of the signal light through the first photodetector 6, thereby improving the frequency locking accuracy.

[0141] Step 7: Lock the power of the Raman light R through the second photodetector 10, the first modulator 8 and the modulator drive module 11.

[0142] Specifically, step 7 includes: Step 71: In the Raman optical path, the optical power is monitored in real time by the second photodetector 10. The detection signal is input to the modulator drive module 11. According to the power feedback signal, the radio frequency power of the first modulator 8 is adjusted to change the diffraction efficiency to stabilize the output power.

[0143] Step 72: Compensate for the power drift of the light source by adjusting the DC component of the light source drive current.

[0144] In an optical quantum gyroscope system, the Raman amplification efficiency is directly related to the power of the Raman beam R. The power of the Raman beam R directly determines the strength of the quantum correlation signal, and fluctuations in its power can lead to instability in the quantum correlation state. Simultaneously, the power of the Raman beam R also determines the backscattering noise in the fiber loop 19, affecting the noise level of the quantum correlation signal and thus influencing the quantum signal.

[0145] Step 8: The integrated control module 12 processes the signal and generates control commands to lock the frequency and power, thereby improving the stability of quantum correlation.

[0146] Specifically, step 8 includes: Step 81: Integrate the locking frequency and locking power modules onto the same control board to obtain the integrated control module 12.

[0147] Step 82: The integrated control module 12 receives frequency and power error signals, integrates a high-speed ADC / DAC and a multi-threaded PID algorithm, and optimizes feedback parameters through a digital signal processor to improve quantum correlation stability.

[0148] Step 83: The digital signal processor receives real-time data from the wavelength meter 4 and the second photodetector 10, calculates the frequency deviation and power deviation, and generates a light source temperature and current adjustment command and a modulator radio frequency signal.

[0149] Step 84: Run the collaborative control algorithm to analyze the correlation between the two factors, such as how temperature drift affects both frequency and power. Establish a pre-compensation model and analyze the correlation between temperature, vibration, and frequency / power drift using historical data.

[0150] Step 85: Perform priority scheduling, prioritize frequency locking in high-noise environments to ensure Raman resonance conditions; optimize power equalization in stable environments, etc.

[0151] The specific embodiments of the present invention have been described in detail above, but they are merely examples, and the present invention is not limited to the specific embodiments described above. For those skilled in the art, any equivalent modifications and substitutions to the present invention are also within the scope of the present invention. Therefore, all equivalent transformations and modifications made without departing from the spirit and scope of the present invention should be covered within the scope of the present invention.

Claims

1. A quantum optical gyroscope system with enhanced quantum correlation stability, characterized in that, include: The system comprises: a first coherent light source (1), a second coherent light source (2), a first beam splitter (3), a wavelength meter (4), a second beam splitter (5), a first photodetector (6), a first polarization beam splitter (7), a first modulator (8), a third beam splitter (9), a second photodetector (10), a modulator drive module (11), an integrated control module (12), an atomic ensemble (13), a second modulator (14), a first half-wave plate (15), a rotator (16), a second polarization beam splitter (17), a second half-wave plate (18), and an optical fiber ring (19), wherein: The first coherent light source (1) generates pump light P, which is split into a beam by the first beam splitter (3) and enters the wavelength meter (4) for monitoring. The main beam enters the atomic ensemble (13). The second coherent light source (2) generates Raman light R, which is split into a beam and enters the wavelength meter (4) for monitoring. The main beam is reflected by the first polarization beam splitter (7), passes through the first modulator (8), and is split by the third beam splitter (9). One beam enters the second photodetector (10) for monitoring. The main beam enters the atomic ensemble (13). The Raman light R and the signal light S exit from the atomic ensemble (13), pass through the second modulator (14), the first half-wave plate (15), and the optical rotator (16), and are split by the second polarization beam splitter (17). The Raman light R is split by the second polarization beam splitter (17). The light is reflected at the second polarization beam splitter (17), enters the fiber ring (19), exits through the second half-wave plate (18), and is transmitted back along the original path. The signal light S is transmitted at the second polarization beam splitter (17), enters the fiber ring (19), exits through the second half-wave plate (18), is reflected at the second polarization beam splitter (17), and returns. Finally, it enters the first photodetector (6). The second photodetector (10) and the modulator drive module (11) are connected by a signal line. The first modulator (8) and the modulator drive module (11) are connected by a signal line. The modulator drive module (11) and the integrated control module (12) are connected by a signal line. The wavelength meter (4) and the integrated control module (12) are connected by a signal line.

2. The optical quantum gyroscope system according to claim 1, characterized in that, The first coherent light source (1) is used to generate pump light P, which polarizes atomic spins. The light field is required to resonate with the atomic transition energy level and operate in continuous mode. The second coherent light source (2) is used to generate incident Raman light R, which is coupled with atomic spin waves. The light field is required to be detuned to the atomic transition energy level and operate in continuous mode.

3. The optical quantum gyroscope system according to claim 1, characterized in that, The first beam splitter (3) is used to split the pump light P, with 10% of the branch used for frequency monitoring by the wavelength meter (4) and 90% of the branch used for incident atomic ensemble (13); the second beam splitter (5) is used to split the Raman light R, with 10% of the branch used for frequency monitoring by the wavelength meter (4) and 90% of the branch used for reflection by the first polarization beam splitter (7); the third beam splitter (9) is used to split the Raman light R, with 10% of the branch used for power monitoring by the second photodetector (10) and 90% of the branch used for incident atomic ensemble (13).

4. The optical quantum gyroscope system according to claim 1, characterized in that, The first photodetector (6) is used to measure the interference signal light S, and the second photodetector (10) is used to detect the power of the Raman light R; the first polarization beam splitter (7) is used to separate the horizontal polarization and vertical polarization of the Raman light R, and the second polarization beam splitter (17) is used to separate the Raman light R and the signal light S; the first modulator (8) is used to stabilize the power of the Raman light R; the second modulator (14) is used to apply phase modulation to the signal light S and the Raman light R, and under the drive of external voltage, the refractive index difference between the fast axis and the slow axis is changed to generate a phase difference, thereby realizing the phase shift of the interference signal.

5. A method for improving the stability of an optical quantum gyroscope with enhanced quantum correlation, characterized in that, Includes the following steps: Step 1: The first coherent light source (1) generates pump light P, which is split into the atomic ensemble (13) and the wavelength meter (4). The second coherent light source (2) generates Raman light R, which is split into the wavelength meter (4), the second photodetector (10), and the atomic ensemble (13). Step 2: The pump light P and the Raman light R realize the Raman scattering process, generating the signal light S and the atomic spin wave A. The signal light S and the Raman light R are injected into the fiber loop (19) and then emitted back into the atomic ensemble (13). The signal light S is detected by the first photodetector (6). Step 3: Lock the frequencies of pump light P and Raman light R using a wavelength meter (4), integrated control module (12), first coherent light source (1), and second coherent light source (2). Step 4: Lock the power of the Raman light R through the second photodetector (10), the first modulator (8), and the modulator driver module (11). Step 5: The signal is processed by the integrated control module (12) to generate control commands, thereby locking the frequency and power and improving the stability of quantum correlation.

6. The optical quantum gyroscope method according to claim 5, characterized in that, Step 1 includes: Step 11: The first coherent light source (1) generates pump light P, which passes through the first beam splitter (3) with a splitting ratio of 1:

9. 90% of the pump light P is incident on the atomic ensemble (13), polarizing the atomic spin and preparing the initial atomic state. 10% of the pump light P enters the wavelength meter (4) to monitor the frequency of the pump light P in real time. Step 12: The second coherent light source (2) generates Raman light R, which passes through the second beam splitter (5) with a splitting ratio of 1:

9. 10% of the Raman light R enters the wavelength meter (4) to monitor the frequency of the Raman light R in real time. 90% of the Raman light R passes through the first polarization beam splitter (7) and then through the first modulator (8) to lock the power of the Raman light R. Step 13: The Raman light R passes through the third beam splitter (9) with a splitting ratio of 1:

9. 10% of the light enters the second photodetector (10) to monitor the power of the Raman light R; 90% of the light enters the atomic ensemble (13) to carry out the Raman scattering process.

7. The optical quantum gyroscope method according to claim 5, characterized in that, Step 2 includes: Step 21: The atomic ensemble (13) realizes the Raman scattering process under the combined action of pump light P and Raman light R, generating signal light S and atomic spin wave A at the same time; Step 22: The atomic spin wave A remains in the atomic ensemble (13), and the signal light S and Raman light R are injected into the clockwise and counterclockwise paths of the fiber ring (19) respectively, and propagate in the opposite direction in the fiber ring (19); Step 23: The signal light S and Raman light R are emitted from the fiber loop (19) into the atomic ensemble (13), where they are spatially combined with the atomic spin wave A, resulting in stimulated Raman scattering. The signal light S and the atomic spin wave A are enhanced by quantum correlation and undergo phase-sensitive interference. Step 24: The signal light of the final output horizontal polarization state is generated and propagates out from the atomic ensemble (13) and enters the first photodetector (6).

8. The optical quantum gyroscope method according to claim 5, characterized in that, Step 3 includes: Step 31: The initial frequencies of the pump light P and the Raman light R are calibrated by a wavelength meter (4), and the frequencies of the pump light P and the Raman light R are monitored in real time. The deviation between the frequency measurement value and the target value is input into the integrated control module (12) in real time. Step 32: The wavelength meter (4) has a built-in PID controller that dynamically adjusts the drive signal according to the output, and dynamically adjusts the drive current of the first coherent light source (1) and the second coherent light source (2) to compensate for slow drift caused by temperature changes and maintain the stability of the quantum correlation of the photonic quantum gyroscope. Step 33: Using the signal light power as an indirect feedback signal for the Raman resonance state, the Raman resonance state is indirectly determined by detecting the power change of the signal light through the first photodetector (6), thereby improving the frequency locking accuracy.

9. The optical quantum gyroscope method according to claim 5, characterized in that, Step 4 includes: Step 41: In the Raman optical path, the optical power is monitored in real time by the second photodetector (10), and the detection signal is input to the modulator drive module (11). According to the power feedback signal, the radio frequency power of the first modulator (8) is adjusted to change the diffraction efficiency to stabilize the output power; Step 42: Compensate for the power drift of the light source by adjusting the DC component of the light source drive current.

10. The optical quantum gyroscope method according to claim 5, characterized in that, Step 5 includes: Step 51: Integrate the locking frequency and locking power modules onto the same control board to obtain the integrated control module (12). Step 52: The integrated control module (12) receives frequency and power error signals, integrates a high-speed ADC / DAC and a multi-threaded PID algorithm, and optimizes feedback parameters through a digital signal processor to improve quantum correlation stability. Step 53: The digital signal processor receives real-time data from the wavelength meter (4) and the second photodetector (10), calculates the frequency deviation and power deviation, and generates a light source temperature and current adjustment command and a modulator radio frequency signal. Step 54: Run the collaborative control algorithm and analyze the correlation between the two factors. For example, if temperature drift simultaneously affects frequency and power, establish a pre-compensation model and analyze the correlation between temperature, vibration, and frequency / power drift using historical data. Step 55: Perform priority scheduling, prioritize frequency locking in high-noise environments to ensure Raman resonance conditions; optimize power equalization in stable environments.

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