31 results about "Quantum measurement" patented technology

This application relates to the field of quantum nondestructive testing technology, and discloses a quantum detection device and a xenon atom-based eddy current detection method. The quantum detection device includes an interconnected eddy current probe and a quantum measurement device. The quantum measurement device includes a xenon atom gas chamber for measuring the magnetic field strength of a target eddy current magnetic field. It acquires the target eddy current magnetic field of the target object, measures the magnetic field strength of the target eddy current magnetic field, and obtains the magnetic field strength distribution along the surface of the target object. Based on the magnetic field strength distribution, it detects thickness changes in the target object to obtain the weak point detection result. Its beneficial effect is that by measuring the eddy current magnetic field generated by the target object through a xenon atom gas chamber, it effectively utilizes the characteristics of xenon atoms—long coherence time and extremely low resonance frequency—thereby maintaining high sensitivity to capture weak magnetic fields at extremely low frequencies and obtaining a detection penetration depth far exceeding that of traditional sensors, achieving high-precision nondestructive testing of minute thickness differences inside the target object.

The invention discloses an NV color center excitation laser adjusting method, a medium, a control device and measurement equipment, and relates to the technical field of quantum measurement. The method is used for the NV color center excitation laser debugging system. The system comprises a laser used for emitting target laser, at least two adjusting lenses used for expanding the target laser, and a focusing lens used for focusing the expanded target laser to generate laser spots. The method comprises the following steps: adjusting an adjusting lens according to a laser spot, so that the laser spot is matched with a laser incident surface of a target diamond; the adjusting lens is adjusted according to the fluorescence brightness generated when the NV color center in the target diamond is excited by the laser spot, so that the area of the laser spot is reduced, the position of the laser spot on the laser incident plane is adjusted, and the fluorescence brightness meets the target excitation requirement. Therefore, the NV color center position can be quickly positioned, the concentration ratio of the laser is enhanced, the laser intensity and the effective utilization rate are improved, and the accuracy and the sensitivity of measuring equipment are improved.

The invention discloses an electric power forest fire early warning method and device based on a quantum measurement technology. The method comprises the steps that multiple pieces of sensing data of a target position in a power line are acquired through a quantum sensor, and the multiple pieces of sensing data comprise temperature data, gas concentration data and electric field intensity data; based on the multiple pieces of sensing data, determining a forest fire risk level of the target position, the forest fire risk level including a low risk, a medium risk, a high risk or an extremely high risk; and performing early warning operation on the target position based on the forest fire risk level. According to the invention, the technical problems of low monitoring precision, slow response, easy interference and unsafe data transmission in a traditional electric power forest fire early warning method are solved.

The utility model discloses a microwave quantum sensing probe based on three-photon excitation. The microwave quantum sensing probe comprises a large rectangular prism, an atomic gas chamber, a color separation prism, a small rectangular prism, a first port, a second port, a third port, a detection light input optical fiber collimator, a decoration light and coupling light optical fiber collimator and a detection light output optical fiber collimator. The device is simple and compact in structure, and can solve the problems that an optical system in a conventional microwave quantum measurement system is complex and huge and cannot carry out portable detection. In addition, the device can also be suitable for a Rydberg atom three-photon excitation mode, and can be combined with the Rydberg atom three-photon excitation mode to build a transportable microwave measurement system suitable for the three-photon excitation mode.

The invention discloses a confocal light path system based on a diamond NV color center and a current detection method, and belongs to the technical field of quantum measurement, the confocal light path system comprises a main control module, an excitation light path module, a microwave driving module, a fluorescence collection module, a fluorescence processing module, an environment adaptive control module, an active feedback regulation and control module and a signal processing module, wherein the main control module is used for generating a synchronous time sequence control signal; the excitation light path module is used for generating, regulating and controlling excitation laser and guiding the excitation laser to the diamond NV color center sample; the microwave driving module is used for generating and applying a microwave field and a magnetic field to the diamond NV color center sample; and the active feedback regulation and control module is used for dynamically generating an optimization parameter instruction according to the preprocessed electric signal and the magnetic field information, and dynamically adjusting the working parameters of the excitation light path module and the microwave driving module. Through full-link modular integration and cooperative intelligent regulation and control, the NV color center current detection precision, stability and applicability are remarkably improved.

The present disclosure provides a mounting method in which is used a linear optical circuit for quantum measurement that is a so-called pairwise fusion gate (PFG) having a function for stochastically projecting two inputted qudits onto the quantum entangled state of a two-qubit subspace. Specifically, provided is a pairwise fusion gate characterized by comprising a linear optical element and a photon detector, the pairwise fusion gate furthermore being characterized in that: the linear optical element and the photon detector are configured so that an input which has two d-dimensional qudits defined using d-rail coding (where d is an integer equal to or greater than 3), and in which there is no quantum entanglement between the two qudits, is stochastically projected onto a quantum entanglement state in a two-qubit subspace; and measurement results from the photon detector are used in determining the specific two-qubit subspace in which the projection onto the quantum entanglement state has been made.

The invention discloses a long-wave time service signal receiving method based on a quantum antenna, and belongs to the technical field of quantum measurement. The core of the method is that Rydberg atoms are used as quantum antennas to receive signals; the method comprises the following steps: firstly, preparing cesium atoms into a highly excited state in a two-photon excitation mode of 852 nm and 509 nm laser; then, applying a direct-current electric field as a local oscillation field in the atomic gas chamber through an electrode plate; when a long-wave time service signal (such as a Roland-C signal) with the frequency of 100kHz arrives, superheterodyne frequency mixing is generated with a direct-current electric field in the atomic gas chamber based on an AC Stark effect, and a frequency mixing signal easy to detect is generated; and finally, the signal is detected through a photoelectric detector and an oscilloscope, and receiving of the time service signal is completed. The atomic system is used for replacing a traditional metal antenna, and the system has the remarkable advantages of high sensitivity, high anti-interference capability, small probe size, easiness in system integration and the like.

This invention discloses a laser excitation and adjustment system and method for NV center-excited lasers, relating to the field of quantum measurement technology. The system is used to transmit laser light to diamond containing NV centers and accurately irradiate them. It includes: a laser, a lens assembly, and a laser detection device; the laser emits the target laser light; the lens assembly is positioned in the optical path of the target laser and is used to expand and focus the target laser light to generate a laser spot; the laser detection device detects the laser spot and obtains the detection result, which is used to adjust the lens assembly to match the laser spot with the diamond laser incident surface; the laser and lens assembly are installed in the target system, and the laser spot irradiates and covers the laser incident surface; the laser power is adjusted so that the fluorescence brightness of the NV centers excited by the laser reaches the target requirement. Thus, a laser spot with a regular shape, high stability, and accurate irradiation of a cluster or a single NV center is obtained.

The present invention achieves quantum measurement with higher time resolution than in the past. This quantum measurement method measures a state change of an object (O) transported by a fluid, by using a plurality of quantum sensors (QSi) disposed along a flow path through which the fluid flows, and the method includes: an introduction step (S11) for introducing the object into the flow path; a measurement step (S12) for measuring the intensity of fluorescence emitted by each quantum sensor when illuminated with excitation light; and an estimation step (S13) for estimating the state of the object from the intensity of the fluorescence at times when a time (ti) required for the introduced object to be transported to each quantum sensor has elapsed.

The invention provides a medium-low vacuum pressure quantum measurement device based on dual-wavelength differential laser frequency stabilization, which comprises the following steps of: firstly, constructing the medium-low vacuum pressure quantum measurement device based on dual-wavelength differential laser frequency stabilization by applying a dual-wavelength differential theory, a dual-frequency laser collaborative frequency stabilization technology and the like, and stabilizing the resonant laser frequency to 10-15 orders of magnitude; the measurement precision of medium and low vacuum gas pressure is effectively improved, and the measurement lower limit is expanded to 10 <-2 > Pa magnitude, that is, the frequency stabilization effect based on an optical ultra-stable cavity and a PDH frequency stabilization technology can be effectively and greatly improved by the dual-frequency laser collaborative frequency stabilization system; secondly, an in-situ calibration laser frequency shift high-precision measurement system based on a rubidium atomic clock and an optical frequency comb is utilized to realize high-precision measurement and real-time calibration of the Hertz-magnitude resonant laser frequency shift; finally, interference of common-mode noise such as cavity length elastic deformation and temperature drift accompanied by dynamic pressure change is eliminated by using a gas refractive index measurement method based on a dual-wavelength difference theory, so that the middle-low vacuum gas pressure measurement precision based on an optical interference method is effectively improved, and the measurement lower limit is expanded.

The utility model discloses a measuring device for half-wave voltage of a phase modulator. The measuring device comprises a laser, a signal generator, an interferometer, photoelectric detection equipment and measuring equipment, one arm of the interferometer is provided with a phase modulator to be measured; the signal generator is a pulse signal generator. The utility model discloses a device for measuring the half-wave voltage of a phase modulator, which is characterized in that a pulse modulation electric signal is output by a pulse signal generator to drive a phase modulator to be measured, so that the adverse effect of interference optical signal phase drift on the half-wave voltage measurement can be effectively eliminated, and the accurate measurement of the half-wave voltage is realized. And the optical path is simple in structure and easy to construct, and is widely applied to a QKD system and a quantum measurement and metering system.

The invention discloses a diamond NV color center resonance frequency determination method and device, terminal equipment and a storage medium, and belongs to the field of quantum measurement. The method comprises the following steps: sweeping the frequency of a to-be-detected diamond by a first intensity microwave source, and determining a first formant target frequency according to a first magnetic resonance spectrogram; taking the lowest point frequency of the second magnetic resonance spectrogram as the first formant frequency after the second intensity microwave source sweep frequency; judging whether the decrease amplitude of the ODMR signal at a second formant target frequency obtained at the first formant frequency and the center frequency exceeds a preset threshold value or not, if not, performing frequency sweeping again by using the first intensity microwave source to obtain a third magnetic resonance spectrogram, performing frequency sweeping by using the second intensity microwave source to obtain a fourth magnetic resonance spectrogram, and determining the second formant frequency; if yes, determining a second formant frequency according to the fourth magnetic resonance spectrogram; and taking the first formant frequency and the second formant frequency as the NV color center resonance frequency of the to-be-measured diamond. By implementing the method, the problem of low accuracy of the resonance frequency in the prior art can be solved.

The invention discloses a quantum signal enhancement method, designs a related system, and discusses applications of the quantum signal enhancement method and the related system. According to the enhancement method, the quantum information processing capacity is integrated through auxiliary signals, joint operation and statistical analysis, and the system capacity exceeds the limitation of a single device through architecture design. An example system designed by the invention comprises: (1) a vacuum signal discrimination system which writes photon existence information into an auxiliary signal through combined operation and determines whether the signal is vacuum or not on the premise of not damaging an original signal; when the method is applied to quantum communication, the signal-to-noise ratio can be stabilized to be a constant value irrelevant to channel attenuation, so that any long-distance relay-free quantum communication is supported in principle; (2) a measurement enhancement system obtains a measurement copy by using combined operation compatible with a measurement operator, and the measurement precision is improved; (3) an iteration enhanced photon detection system starts from a single photon detector, and the detection capability is improved step by step through an iteration architecture; according to the scheme, the detection performance comparable to that of a superconducting single-photon detector is realized only based on a non-low-temperature element, the low-temperature environment requirement is avoided, and a large number of high-precision tasks are allowed to be implemented at a non-low temperature. The scheme has wide application prospects in the fields of light source preparation, empty signal detection, quantum measurement, quantum communication, quantum calculation and the like.

The invention discloses a computing power migration method and device based on a quantum measurement technology. The method comprises the following steps: acquiring a real-time quantum signal of a power system; determining a plurality of target feature data based on the real-time quantum signal; the multiple pieces of target feature data are input into a preset migration decision model, a Pareto optimal solution set used for cross-system computing power migration is obtained, the migration decision model is constructed based on a quantum tunneling improved non-dominated sorting genetic algorithm, and the Pareto optimal solution set comprises multiple alternative migration schemes; determining a target migration scheme in the alternative migration schemes; and migrating the computing power resources of the first region to the second region based on the target migration scheme. The technical problems that in the prior art, cross-regional computing power migration cannot accurately match new energy output in real time, so that the new energy consumption rate is not increased enough, and computing power scheduling is mismatched with the new energy output are solved.

This invention discloses a method, medium, control device, and measuring equipment for adjusting NV center-excited lasers, relating to the field of quantum measurement technology. The method is used in an NV center-excited laser calibration system. The system includes a laser for emitting a target laser, at least two adjusting lenses for expanding the target laser beam, and a focusing lens for focusing the expanded target laser beam to generate a laser spot. The method includes: adjusting the adjusting lenses according to the laser spot to match the laser incident surface of the target diamond; and adjusting the adjusting lenses according to the fluorescence intensity generated by the laser spot excitation of the NV centers in the target diamond to reduce the laser spot area and adjust its position on the laser incident surface, ensuring the fluorescence intensity meets the target excitation requirements. This enables rapid positioning of the NV centers, enhances laser concentration, improves laser intensity and utilization efficiency, thereby improving the accuracy and sensitivity of the measuring equipment.

In order to solve the problem that the response speed and the dynamic range are difficult to consider when diamond is used for current quantum measurement at present, the invention provides a current measurement method based on microwave matching type phase-sensitive detection, quantum state information is rapidly extracted by selecting phase-sensitive detection frequency points in a jumping mode, the frequency band of formant offset after current change is calculated, and the response speed and the dynamic range are calculated. The number of microwave sweep frequency points is effectively reduced, and the phase-sensitive detection bandwidth is expanded, so that the response speed and the dynamic range of measurement are improved. The measuring system comprises a diamond sample, an optical integration system, an electrical integration system and an upper computer. In combination with the measurement method provided by the invention, the high sensitivity characteristic of diamond current measurement can be maintained, the measurement response speed and the dynamic range are remarkably improved, and the method has important application value for realizing large-range and high-real-time current measurement by a diamond NV color center quantum measurement system.

The utility model relates to the technical field of quantum measurement and sensing, and discloses an air exhaust hole chamfering atomic air chamber which comprises an atomic air chamber main shell, the lower portion of the atomic air chamber main shell is fixedly connected with an air exhaust pipe body, an air storage chamber is arranged in the atomic air chamber main shell, a chamfering body is arranged in the lower middle of the air storage chamber, and the air exhaust pipe body is fixedly connected with the air exhaust pipe body. The lower part of the chamfering body is provided with an exhaust hole body, the lower part of the atomic gas chamber main shell is provided with a light-transmitting sheet, the chamfering body is processed by laser or machining, the inner wall of the atomic gas chamber main shell is processed by a polishing process, and the inner wall of the atomic gas chamber main shell is provided with a plated antireflection film. According to the utility model, through the design of the chamfer, the shape of the cleaning liquid flow channel is improved, the flow resistance is reduced, the cleaning liquid can be better discharged, the cleaning liquid is prevented from remaining in the gas chamber, a better cleaning effect is achieved, the cleanliness in the atomic gas chamber is improved, and the working performance of the atomic gas chamber is improved.

This invention provides a high-coupling-efficiency microstrip antenna and a quantum measurement device based on NV color centers. It belongs to the field of NV color center technology. The microstrip antenna includes: a dielectric substrate, a ground plane disposed on a first surface of the dielectric substrate, a radiating patch disposed on a second surface of the dielectric substrate, a feeding structure, and an NV color center diamond. The radiating patch includes an outer radiating patch and an inner radiating patch nested together. The outer radiating patch surrounds an outer region, and the inner radiating patch is located within the outer region, with a gap between them. The inner radiating patch surrounds an inner region. The NV color center diamond is fixed to the second surface of the dielectric substrate and located within the inner region. One end of the feeding structure is connected to the outer radiating patch. This microstrip antenna achieves precise matching with the resonant frequency of the NV color center, improving electromagnetic field coupling efficiency, reducing signal reflection and transmission loss, and enhancing the stability and sensitivity of the quantum measurement system.

The invention relates to the field of NV color center quantum measurement, in particular to a built-in installation method of an NV color center partial discharge quantum measurement device, and the method comprises the steps: constructing a low-magnetic-conductivity multifunctional installation base, an integrated optical cable, an electric cable and a microwave line independent sealing channel; a passive vibration isolation support composed of a first-stage rigid support and a second-stage flexible vibration isolation platform is assembled, and the inherent frequency of the passive vibration isolation support is lower than the main vibration frequency of the extra-high voltage reactor; a double-layer vacuum heat-insulation shielding cover with the inner wall plated with a high-permeability film is sleeved to restrain heat conduction and electromagnetic noise; wing plates with binding holes are arranged on the outer wall of the support, so that leads are arranged in order. And a modularized cylindrical bracket is adopted to support rapid replacement of the sensor. According to the technical scheme, the NV color center spin coherence time is remarkably prolonged, the partial discharge detection sensitivity is improved to 5 picocoulomb, the signal fluctuation is reduced to below 1 / 5 of that of a traditional structure, and the long-term maintenance-free online monitoring requirement of extra-high voltage equipment is met.

The utility model discloses a high-precision water body euphotic layer depth measuring device which comprises a telescopic rod, a multichannel data recorder, a counter, a rope winding disc and a cable rope, the handle end of the telescopic rod is provided with the multichannel data recorder, the counter and the rope winding disc, and the tail end of the output end of the telescopic rod is provided with a fixed pulley module. The multi-channel data recorder is connected with the underwater light quantum measurement module through the cable rope, the cable rope sequentially passes through the rope winding disc, the counter and the fixed pulley module, underwater light quantum measurement is facilitated, detection can be conducted at any position, and meanwhile the water depth of the detection end is measured.

The invention discloses a harmful gas leakage early warning and tracing method based on multi-mode OGI fusion, and the method comprises the following steps: collecting an image, and constructing an optical gas imaging spatial-temporal feature sequence; collecting gas concentration data, and constructing a concentration diffusion characteristic sequence; collecting meteorological data, and constructing a wind field driving feature sequence; constructing a cross-modal consistency feature vector based on the three types of feature sequences, and constructing a quantum feature state sequence; generating and updating a fused and updated quantum rotation angle parameter sequence; quantum measurement is executed, and quantum fusion probability distribution is generated; gas leakage abnormity is identified, and a leakage detection result and leakage early warning information are generated; constructing a traceability inversion equation, solving a leakage source position and leakage starting time, and obtaining a traceability result; and updating the quantum rotation angle parameter sequence, and tracing and solving in real time to obtain the real-time position estimation of the leakage source. According to the invention, multi-source imaging and quantum intelligence are fused, accurate detection early warning and traceability of gas leakage are realized, and the method has the advantage of high sensitivity.

The application relates to the field of NV color center quantum measurement, in particular to a built-in mounting method of an NV color center partial discharge quantum measurement device, which comprises the following steps: constructing a low-permeability multifunctional mounting base, integrating independent sealed channels of optical cables, electric cables and microwave lines; assembling a passive vibration isolation support composed of a first-stage rigid support and a second-stage flexible vibration isolation platform, the inherent frequency of which is lower than the main vibration frequency of an extra-high voltage reactor; sleeving a shielding cover with double-layer vacuum insulation and a high-permeability film plated on the inner wall to inhibit heat conduction and electromagnetic noise; arranging a wing plate with a binding hole on the outer wall of the support to realize orderly arrangement of lead wires; and adopting a modular cylindrical support to support sensor quick replacement. Through the technical scheme, the NV color center spin coherence time is significantly prolonged, the partial discharge detection sensitivity is improved to 5 picocoulombs, the signal fluctuation is reduced to less than 1 / 5 of that of a traditional structure, and the long-term maintenance-free online monitoring demand of an extra-high voltage device is met.

The invention discloses a nanoliter flow sensing device and a flow measuring method, and belongs to the field of microfluidic technology, quantum sensors and quantum measurement. The sensing device comprises a quartz capillary sensing unit, an integrated optical probe, a miniaturized microwave feed-in system and a high-speed signal processing unit. NV color center nano-diamond particles are fixed on the inner wall of the quartz capillary sensing unit in a chemical bonding manner to form a sensing array distributed along the fluid channel. According to the invention, the sensor is integrated in the capillary tube by using the surface functional modification and laminar flow positioning technology, and the dual-mode working mode of confocal scanning point temperature measurement and wide-field fluorescence intensity ratio temperature measurement is combined; non-intrusive, high-temporal-spatial-resolution and in-situ dynamic measurement of fluid temperature distribution of fluid in the capillary tube from a single point to a two-dimensional section is realized. According to the scheme, rapid, in-situ and on-line monitoring of the flow velocity of the fluid in the capillary tube is realized, and the capillary tube is particularly suitable for application scenarios of a nano-liter liquid chromatograph or biochemical microfluidics.

Provided is a measurement method using a quantum optical system configured to cause quantum interference between a plurality of physical processes in which quantum entangled photon pairs of signal photons and idler photons are generated, the method comprising executing object part quantum measurement for acquiring a quantum interference signal for a measurement object part included in a sample and having unknown reflectance at the wavelength of the idler photons, and calculating the reflectance of the measurement object part from the quantum interference signal acquired by the object part quantum measurement, the object part quantum measurement including sweeping the optical path length difference between the optical path length of the signal photons and the optical path length of the idler photons by adjusting the optical path length of the signal photons, or the optical path length of the idler photons when the idler photons are reflected by the measurement object part.

The invention discloses an NV color center excitation laser debugging system and method, and relates to the technical field of quantum measurement. The system is used for transmitting laser to a diamond with an NV color center, can accurately irradiate the NV color center, and comprises a laser, a lens assembly and a laser detection device, the laser is used for emitting target laser; the lens assembly is arranged on a light path of the target laser and is used for carrying out beam expanding and focusing treatment on the target laser so as to generate laser spots; the laser detection device is used for detecting the laser spot to obtain a detection result so as to adjust the lens assembly, so that the laser spot is matched with the laser incident surface of the diamond; the laser and the lens assembly are installed in a target system, a laser spot irradiates and covers a laser incident plane, and the laser power is adjusted, so that the brightness of fluorescence excited by the laser in the NV color center meets the target requirement. Therefore, a laser spot which is regular in shape, high in stability and capable of accurately irradiating on an NV color center cluster or a single color center is obtained.

Methods and apparatus for measuring quantum systems involve: applying first optical pulses to the quantum system and monitoring for a first resulting photon after each first optical pulse; in response to detecting one or more first resulting photons, performing a π operation on the quantum system; and, after performing the π operation, applying second optical pulses to the quantum system and monitoring for a second resulting photon after each second optical pulse. The first and second optical pulses comprise a wavelength corresponding to a transition from a first basis state of the quantum system to an excited state. A measurement result is determined based on results of the monitoring.

The utility model provides an identical photon pair light source, which comprises a pump laser, a nonlinear waveguide, a filter, a wavelength division multiplexer and a single photon frequency shifter, can output a plurality of identical photon pairs with different wavelengths through a single nonlinear waveguide, and is simple and compact in structure, high in integration level, wide in spectral range of the generated identical photon pairs, and high in efficiency. And multiple wavebands and multiple application scenes, such as a quantum communication waveband, a quantum measurement waveband and a quantum optical experiment waveband, are supported.

The application belongs to the technical field of target detection and identification, and discloses a quantum radar experimental device based on a quantum state comparator, which comprises a transmitter and a receiver, the transmitter comprises a quantum entanglement source, the quantum entanglement source is a three-mode quantum entanglement state prepared by a cascade second-order nonlinear process; the receiver comprises a signal collection unit, two quantum storages, a quantum state comparator and a target information inversion unit, the signal collection unit is used for receiving signals reflected by a target and sending the signals to the two quantum storages respectively, the quantum state comparator is used for comparing quantum states in the two quantum storages, and the target information inversion unit is used for inferring target information according to a comparison result of the quantum state comparator. The application can realize efficient judgment of the existence of a target through the quantum state comparator, and further solve the problem of additional resource consumption caused by quantum measurement in the existing quantum radar.

A non-linear superconducting quantum circuit having a first mode and a second mode is disclosed, wherein the first mode and the second mode have respective resonant frequencies. The circuit is configured such that the resonant frequency of the second mode is substantially 2N times the resonant frequency of the first mode when a predetermined current of a constant intensity is applied to the circuit. The circuit intrinsically performs a resonant 2N-to-1 photon exchange between respectively the first mode and the second mode, with N being a positive integer, thus improving the non-linear superconducting quantum circuit. When this circuit receives a predetermined current and when the second mode is driven appropriately, the circuit can stabilize a cat-qubit. In order to perform quantum measurements on this circuit, the drive of the second mode is turned off, thus switching to a no-drive manifold such that the quantum measurements can be performed.

The application provides a compensation method for asymmetric errors of a two-path weak measurement system and the two-path weak measurement system, and can be applied to the technical field of quantum measurement. The compensation method comprises the following steps: in the case that the size of a signal of wide spectrum light passing through the two-path weak measurement system and being weakly coupled with a weak coupling module is within a predetermined range, a square wave signal with a predetermined amplitude is applied to a push-pull phase modulator, and four first detection signals are obtained by using a collection module for two-part detection; in the case that the predetermined amplitude is not 0, a first error introduced by asymmetric loss of the two-path weak measurement system is determined according to the corresponding four first detection signals; a second error introduced by asymmetric filtering of the two-path weak measurement system is determined according to the four first detection signals corresponding to the square wave signal with the predetermined amplitude of 0 and the first error; and the asymmetric error compensation is performed on a response formula according to the first error and the second error, so that the two-path weak measurement system has high sensitivity and stability.