72 results about "Laser cooling" patented technology

The invention relates to the field of cooling-water machines, and particularly discloses highly-integrated laser cooling-water equipment which comprises a laser cooling-water machine. The graded cold water circulating device is connected with the top side of the laser water chiller; the flow dividing pipe assembly is connected with the grading cold water circulating device; the cooling liquid master control device is connected with the laser water chiller; an intelligent adjusting module; the staged cold water circulation device comprises a stepped cold water tank assembly and a water tank assembly, a middle driving assembly; the cooling liquid master control device comprises a liquid inlet control assembly and a liquid outlet control assembly, wherein the liquid inlet control assembly is connected with the laser cooling-water machine; the liquid discharge control assembly is connected with the laser water chiller; through cooperative work of the stepped cold water tank assembly, the flow dividing pipe assembly and the like, the cooling liquid flow can be distributed according to needs, and multi-assembly cooperative control is achieved through the intelligent adjusting module. The inclined arrangement and the water disturbing plate accelerate heat removal, and the liquid inlet and outlet control assembly facilitates replacement of cooling liquid.

This atom trap device 10 for trapping atoms comprises an atom trap unit 16 on which an atomic gas beam is incident. The atom trap unit 16 includes a plurality of optical elements that form a laser light group 18, and a magnetic field generation unit 22. The magnetic field generation unit 22 is provided with at least two spiral coils and, if necessary, a tapered solenoid coil, and optimizes a magnetic field in a guide direction. The spiral coils are configured so that the tip becomes thinner and the winding density becomes sparse as the atoms advance in the direction in which the atoms are guided. The spiral coils are arranged so as to face each other so that an interval therebetween becomes narrower as the atoms advance in the direction in which the atoms are guided. The tapered solenoid coil generates a magnetic field that optimizes the guiding of the atoms and the laser cooling during the guiding by adjusting the component in the direction in which the atoms of the magnetic field generated by the spiral coils are guided. The atom trap unit 16 may also include a baseball coil instead of the spiral coils and the tapered solenoid coil.

This invention belongs to the technical field of laser chiller control methods, and particularly relates to a laser chiller control temperature difference adaptive correction method. It includes the following steps: detecting laser operating parameters based on the flow rate-temperature difference method and calculating waste heat; based on the calculated waste heat, detecting the waste heat at the start of each laser operating cycle and plotting a waste heat change curve over time; selecting a heat balance line based on the change curve and calculating the control temperature difference; and adjusting the chiller's cooling capacity. This laser chiller control temperature difference adaptive correction method optimizes the chiller's cooling capacity output by using the laser's waste heat change as a condition, thereby optimizing the cooling water temperature circulation. It utilizes the cooling water's cooling capacity circulation to achieve water temperature balance optimization, reduce water temperature fluctuations, and determine the control temperature difference. This solution is simple, efficient, and highly practical, and can improve problems such as the mismatch between refrigeration and cooling demands in traditional chillers, thus improving system efficiency.

The invention belongs to the technical field of laser equipment, and discloses a quality inspection method for a refrigerant direct cooling laser cooling system, which comprises the following steps: acquiring an environment temperature, setting a starting parameter according to the environment temperature, and starting a quality inspection system and a cooling system according to the starting parameter. After a quality inspection system and a cooling system are started, quality inspection data are obtained, and the quality inspection data comprise the cold plate temperature, the superheat degree and the condensing coil pipe temperature; and comparing whether the cold plate temperature, the superheat degree and the condensing coil temperature are consistent, if so, determining that the cooling system is qualified, and if not, determining that the cooling system is unqualified. According to the invention, the purposes of simple quality inspection process, time saving, low cost and full inspection can be achieved. The invention also discloses a quality inspection system for the cooling system of the refrigerant direct-cooling laser.

The invention discloses a double-light-path high-frequency pulse laser processing device, relates to the technical field of high-frequency pulse laser processing, and aims to solve the problem that local overheating is prone to occurring in the high-frequency pulse laser processing process. The double-light-path high-frequency pulse laser processing device comprises a workbench, two pulse controllers are arranged above the workbench, and laser heads are arranged at the front ends of the pulse controllers; and laser cooling assemblies are arranged on the outer sides of the pulse controllers and comprise coolers, the coolers surround the outer sides of the laser heads, arc-shaped sliding groove plates are arranged on the outer sides of the laser heads, and the coolers are located between the laser heads and the arc-shaped sliding groove plates. The double-light-path high-frequency pulse laser processing device has the technical effects that the cooler continuously moves around the laser head and the pulse controller, the laser head and the pulse controller can be cooled in an omnibearing and uniform mode, local overheating is avoided, it is effectively guaranteed that the laser head and the pulse controller work at the proper temperature, and the service life of equipment is prolonged.

The present invention relates to the technical field of cold atomic clocks and provides a multifunctional microwave cavity for a cold atomic clock, comprising a cavity body and upper and lower end caps disposed at the upper and lower ends of the cavity body, respectively. The multifunctional microwave cavity for a cold atomic clock provided by the present invention can perform operations such as laser cooling, state selection, and detection on atoms located at the center of the cavity body, thereby expanding the microwave cavity from a single microwave excitation function to a multifunctional microwave cavity capable of satisfying all cold atomic clock operations. This improves microwave cavity utilization, significantly reduces the overall volume and weight of the cold atomic clock, and transforms the atomic action region of the cold atomic clock from a separate type to an integrated type, thereby reducing system dead time, significantly minimizing the Dick effect, and simultaneously reducing atomic loss and quantum projection noise.

1. The name of the design product: laser engraving equipment. 2. The use of the design product: for laser engraving equipment and laser cooling device integration, can directly carve products. 3. The design points of the design product: in shape. 4. The picture or photo that best indicates the design points: perspective view 1.

An optical trap for laser cooling and trapping atoms without needing a magnetic field. Three pairs of parallel counterpropagating laser beams are directed to cross in a vacuum chamber to form a trapping volume. Rather than having a mutually orthogonal arrangement in which the optical axes of each beam pair forms an angle χ of 45° to a reference axis, z, these angles are instead between 5° ≤ χ ≤ 40° to form a tripod-like arrangement. The beam pairs each have a significant overlap between their counter-propagating beams within the trapping volume which can be defined by the sum of the beam half-widths of the beams of each pair not exceeding twice the beam pair separation distance. Moreover, for good trap formation, at least one of the parallel beam pairs should be sufficiently separated, having a beam half-width sum of at least a quarter of the separation distance.

The invention discloses a brushless direct current motor driven high-precision optical switch device for a cold atomic clock and a control method, the device comprises an FPGA control panel, a three-phase brushless direct current motor, a light blocking blade, a driving circuit and a photoelectric detection circuit, the light blocking blade is fixed on a motor rotating shaft, and the blade is provided with a 15-degree light hole and a symmetrically excavated mass balance structure. It is ensured that the laser on-off time accounts for 17% and the rotational inertia is uniform; the FPGA starts the motor through six-step commutation, estimates an electrical angle in real time in combination with Hall signal interpolation, is switched to a sine wave control mode to generate a seven-segment SVPWM waveform, and dynamically adjusts PID parameters to realize that the periodic fluctuation of the motor is less than + / -0.25 ms. The photoelectric detection circuit feeds back the rotating speed to form closed-loop control, and the drive circuit is integrated with a dead-zone compensation module to reduce harmonic interference. The extinction ratio is superior to 40dB, the frequency accuracy and long-term stability of the cold atomic clock are improved, and the cold atomic clock is suitable for high-precision sequential control scenes such as laser cooling and atomic detection.

The present invention discloses an ion thermometer based on a cold ion cluster, which relates to the field of temperature measurement technology and can be used for precise measurement and monitoring of ambient temperature in ultra-low temperature research. The thermometer uses a laser-cooled cold ion cluster as a temperature sensor. The motion temperature of the cold ion cluster is strongly coupled with the temperature of the gas in the vacuum chamber, and the temperature of the gas in the vacuum chamber is consistent with the ambient temperature when the temperature is balanced. By evaluating the increase in the motion temperature of the ion cluster caused by background gas collisions under different environments, the temperature of the background gas can be evaluated, thereby obtaining the measured ambient temperature. It includes a vacuum chamber, a camera, an ion trap, a metal target, a vacuum pump, an optical switch, cooling light, sputtering light, an optical fiber, a power supply and control system, an ultra-high vacuum electrode feedthrough, and an ultra-high vacuum optical fiber feedthrough; the thermometer measures the ambient temperature from a microscopic perspective and from the essence of heat exchange, has higher temperature measurement sensitivity and accuracy, and can be used for high-precision measurement and monitoring of the temperature in an ultra-low temperature environment.

The utility model relates to the technical field of lasers, in particular to a frost crack prevention structure on a laser cooling pipeline, which comprises an inner assembly and a cooling liquid transmission assembly, the inner assembly comprises an inner pipe, the inner pipe is an elastic hose, the cooling liquid transmission assembly comprises a to-be-cooled body, a plug and a support pad, a cavity is arranged in the to-be-cooled body, and the cavity is communicated with the cavity. The inner pipe is located in the body needing to be cooled, the corresponding plugs are used for blocking the ends of the inner pipe respectively, supporting pads are arranged at the two ends in the body needing to be cooled, a plurality of through holes corresponding to the ends of the inner pipe are formed in the supporting pads, and the supporting pads are flexible and tightly attached to the inner wall of the body needing to be cooled. The cooling device has the effect of avoiding the situation that after cooling water encounters extremely low-temperature weather, the volume of the cooling water is expanded due to freezing, pipelines or equipment are damaged, and irreparable losses are caused.

This application provides a rubidium optically pumped magnetometer and its measurement method, belonging to the field of magnetometer technology. The entangled photon component includes a first laser and a nonlinear optical crystal, the nonlinear optical crystal being used to convert photons emitted by the first laser into entangled photon pairs; a rubidium atom gas cell for receiving the entangled photon pairs; a laser cooling system for cooling rubidium atoms to a Bose-Einstein condensate; and an interferometer phase detection system including a second laser, a first beam splitter, a beam combiner, and a signal processor. This application introduces entangled photons to form a quantum entangled state with rubidium atoms. The introduced entangled photons, through coupling with the rubidium atom system, form an enhanced quantum interference effect. Traditional rubidium optically pumped magnetometers are limited in measurement accuracy by quantum noise, but by introducing entangled photons, the system's measurement noise is reduced, thereby achieving higher measurement accuracy.

An optical trap 300 for laser cooling and trapping atoms without needing a magnetic field, comprising: a vacuum chamber 350 in which atoms can be laser cooled via excitation of an electron transition, the cooling transition; a laser source 310, 312, 314 configured to generate first to sixth beams of laser light of respective first to sixth beam widths and half-widths, the beams all having a frequency that is detuned below the frequency of the cooling transition; an optical arrangement 334, 336, 338 configured to direct the beams to generate first, second and third counter-propagating beam pairs respectively comprising the first, third, or fifth and second, fourth or sixth beams, such that the beam pairs cross each other in a volume of intersection within the vacuum chamber, the trapping volume; wherein the first, third and fifth beams having an alignment angle to a reference axis between 5° and 40°; and wherein each beam in a pair extend parallel to each other, laterally offset from each other by a beam pair separation distance.

A method for preparing a gradient composition of a manganese-copper alloy with improved toughness belongs to the technical field of alloy preparation, and comprises the following steps: uniformly mixing copper powder and manganese powder into surface powder and core powder, and dynamically adjusting the feeding ratio of the surface powder and the core powder by a double powder feeder; performing laser sintering during the feeding process, and adjusting the manganese content in the feed by the double powder feeder for each deposited layer; after the sintering is completed, applying a strong axial magnetic field to drive Mn atoms to migrate toward the tail of the molten pool to form a composition gradient strengthening; performing sequential annealing treatment and surface nano-processing to obtain a manganese-copper alloy; forming nanocrystals and solid solution strengthening by rapid laser cooling to improve the strength of the manganese-copper alloy, and the coarse columnar crystals induced by the magnetic field provide high fracture toughness.

A system for performing sympathetic laser cooling is provided. The system includes a confinement apparatus configured to confine an object crystal that includes a qubit object and a coolant object in a cooling area. The system further includes manipulation sources configured to generate first and second manipulation signals. When the first and second manipulation signals are applied to the coolant object, the first and second manipulation signals collectively drive a sideband transition of the coolant object between a first quantum state and a second quantum state that is characterized by a red effective detuning that corresponds to at least one motional mode frequency of the object crystal. The system further includes one or more beam path systems that provide the first and second manipulation signals to the cooling area and one of the first or second manipulation signal is provided as a spatially structured optical field within the cooling area.

The invention discloses an air cooling system of a laser water chiller. The air cooling system comprises a cooling fan, a rectifying device, a compressor, a refrigerant cooling pipeline and a front evaporator refrigerant pipeline. The refrigerant cooling pipeline comprises a condenser; the front evaporator refrigerant pipeline comprises a front evaporator located in the front area. A plurality of condensation ventilation channels for airflow to flow through are formed in the condenser; the rectifying device comprises a first rectifying cavity and a second rectifying cavity which are sequentially arranged in the airflow flowing direction. The first rectifying cavity is used for weakening vortex flow caused by rotation of the cooling fan; the second rectifying cavity is used for promoting airflow to enter the condensation ventilation channel in the mode of being parallel to the extension direction of the condensation ventilation channel. The heat dissipation efficiency can be improved, the condensing pressure of the system is reduced, the exhaust temperature and the running current of the compressor are reduced, and it can be ensured that the compressor normally works in a high-temperature environment.

This application provides a Bayesian optimization-based optimization method for integral sphere diffuse reflection laser cooling, which can find the optimal parameter combination in fewer iterations, improving the efficiency of experimental parameter optimization for integral sphere diffuse reflection laser cooling. The method includes: determining the optimization parameter range for the frequency and power of the cooling light, re-pump light, and probe light; within this range, selecting at least one set of initial parameters for the frequency and power of the cooling light, re-pump light, and probe light and experimenting in an integral sphere diffuse reflection laser cooling system to obtain the cost function value corresponding to each set of initial parameters; each set of initial parameters and its corresponding cost function value constitutes an initial dataset; based on the initial dataset, using a Bayesian optimization algorithm to fit the cost function and predict the optimal parameters; conducting experiments with the optimal parameters to obtain the cost function value corresponding to the optimal parameters; subsequently determining whether the cost function value corresponding to the optimal parameters meets preset conditions, thereby determining the final optimal parameters.

The present application relates to a kind of lamp-pumped laser cooling water anti-freezing device, the anti-freezing device includes control circuit, water inlet, water outlet and drain, and the water inlet solenoid valve, constant temperature water tank, self-priming pump and three-position three-way solenoid valve connected in sequence;Water outlet, drain and constant temperature water tank form three-way;Control circuit is used to control the opening and closing of water inlet solenoid valve, constant temperature water tank, self-priming pump and three-position three-way solenoid valve;Constant temperature water tank is used to make water temperature stable in a certain range around set value;Water inlet solenoid valve is used to control the opening and closing of water inlet;Self-priming pump is used to provide power for water circulation;Three-position three-way solenoid valve is used to control the opening and closing of water outlet and drain;Water inlet and water outlet are used to be connected with laser and cooling water machine respectively through water pipe, to realize the continuous circulation of water in anti-freezing device, laser and cooling water machine to achieve the purpose of anti-freezing;Drain is used to discharge water in anti-freezing device, laser and cooling water machine.

A core-shell nanoparticle having a cleaned nitrogen-vacancy nanodiamond (NVND) core surrounded by an upconversion nanoparticle (UCNP) shell, wherein the cleaned nitrogen-vacancy nanodiamond (NVND) core comprises a cleaned nitrogen-vacancy nanodiamond, wherein the UCNP shell comprises an upconversion nanoparticle (UCNP), wherein the UCNP comprises lithium yttrium fluoride (LiYF4) doped with a lanthanide ion combination, wherein the lanthanide ion combination comprises a M1 ion and a M2 ion, wherein M1 is ytterbium (Yb) or neodymium (Nd) and M2 is erbium (Er), thulium (Tm) or holmium (Ho), and wherein the core-shell nanoparticle emits a red-emission upon a near-infrared (NIR) excitation is disclosed. Integration of cleaned NVNDs with UNCPs for enhancing optical manipulation and enabling efficient energy transfer for applications in biological imaging, quantum sensing and laser cooling is disclosed.

In an example, the present invention provides a modular quantum computer system. The system has at least one quantum computer cell system. In an example, the system has a plurality of qubits comprising a laser coolable atom, ion, nitrogen vacancy center, silicon color center or qubit systems with an optical control capability, such that a number of the qubits range from one to 100,000, among others. In an example, the quantum computer cell system has an optical link. The optical link has a photon collection system or a pair of optical mirrors characterized by a mirror reflectivity >90% and configured to form a cavity, the cavity having a length, e.g., ranging from 1 micrometer to 1 centimeter or longer.

This invention relates to the field of optical instrument technology and discloses an experimental device for trapping cold molecular ions. The device includes a frame placed on the ground, and further comprises: a main cavity, fixedly mounted on the surface of the frame away from the ground, wherein an installation and storage area is provided inside the main cavity; an electric field trapping component, disposed on the main cavity, for forming a three-dimensional trapping potential well for charged ions; a vacuum pumping component, disposed on the frame and connected to the main cavity, for creating a vacuum environment within the installation and storage area of ​​the main cavity; a laser cooling component, disposed on the main cavity and connected to the installation and storage area within the main cavity; and an optical measurement component, disposed on the main cavity for measuring the state of ions within the installation and storage area of ​​the main cavity. The purpose of this experimental device for trapping cold molecular ions is to solve the problems of large footprint, non-compact structure, and high construction costs in existing technologies.

The present invention relates to the field of semiconductor photolithography and discloses a linewidth narrowing module and a heat dissipation control system thereof. The module comprises a housing, wherein a prism, a grating and a cooling assembly are fixedly arranged in the housing. The prism is used to expand an excimer laser spot; the grating is used to select the spectrum of the excimer laser and form a diffracted laser; the cooling assembly comprises a first cold plate group and a second cold plate group, the first cold plate group is fixedly attached to the prism to reduce the temperature of the prism, and the second cold plate group is fixedly attached to the grating to reduce the temperature of the grating; the first cold plate group and the second cold plate group are both provided with cooling channels for the flow of cooling liquid; the present invention arranges cold plate groups on the surfaces of the prism and the grating, and inputs cooling liquid into the cooling channels of the cold plate groups, so as to efficiently remove the accumulated heat generated in the prism and the grating, avoid thermal distortion of the prism and the grating, and ultimately ensure the stability of the laser wavelength, thereby achieving higher heat dissipation efficiency and lower cost.

The utility model discloses a circulating water control cabinet and a laser cooling system, and relates to the technical field of laser heat dissipation, the circulating water control cabinet is used for heat dissipation of a laser, the circulating water control cabinet comprises a water supply device, a three-way structural member, a backwater decoupling strand and a drainage structure, the three-way structural member comprises a first connecting end and two second connecting ends, the water return structure comprises a first three-way valve, the first three-way valve comprises a discharge end and two water return connecting ends, and the two water return connecting ends are connected with the water supply device and the laser respectively; the drain pipe is arranged at the discharge end of the first three-way valve; in the scheme of the utility model, compared with the current situation that a water pipe is dismounted in a workshop, the circulating water control cabinet can completely drain residual accumulated water in the laser before the water pipe is dismounted, thereby preventing the accumulated water from flowing into the ground and avoiding potential safety hazards.

The application discloses a kind of molecular sub-Doppler cooling magneto-optical trap design method based on artificial intelligence algorithm, belong to molecular laser cooling technical field.First, construct three-dimensional molecular magneto-optical trap scheme model, then solve the optical Bloch equation of three-dimensional molecular magneto-optical trap scheme model, obtain trapping and cooling acceleration from this;Further optimize trapping and cooling acceleration calculated by optical Bloch equation, to obtain the best parameter point that can simultaneously have trapping and cooling in preset speed and preset spatial range.The present application first introduces Bayesian optimization algorithm into molecular magneto-optical trap design, solves the big problem that has plagued molecular laser cooling, i.e.sub-Doppler heating effect in type II magneto-optical trap.Three-dimensional Monte Carlo simulation shows that the scheme can reduce the temperature of molecular magneto-optical trap to 40 μK, and its phase space density increases by two orders of magnitude, which is a key step to realize molecular Bose-Einstein condensation.

A method for laser cooling an object crystal comprising at least two atomic objects and confined by a confinement apparatus is provided. A controller controls one or more manipulation sources to cause a first instance of manipulation signals to be incident on the object crystal at a target location defined at least in part by the confinement apparatus. The manipulation signals are configured to laser cool a first motional mode of the object crystal. The controller causes an adiabatic transfer of phonons from a second motional mode of the object crystal to the first motional mode of the object crystal. The controller controls the one or more manipulation sources to cause a second instance of the manipulation signals to be incident on the object crystal at the target location. The manipulation signals are configured to laser cool the first motional mode of the object crystal.

The application discloses a laser cooling heat sink with a micro-channel structure, which comprises a micro-channel heat sink working end, a heat-conducting metal filling layer, a micro-channel heat dissipation reinforcing end and a heat sink base, the micro-channel heat sink working end and the micro-channel heat dissipation reinforcing end are sequentially arranged in the heat sink base, the working surface of the micro-channel heat sink working end is attached to the cooling surface of a laser crystal, the heat dissipation surface of the micro-channel heat sink working end is provided with a micro-channel structure, the micro-channel structure is connected with the micro-channel heat dissipation reinforcing end which is also provided with a micro-channel structure through the heat-conducting metal filling layer, the micro-channel structure is formed by pressing the heat dissipation ribs which are arranged in a staggered mode, liquid inlet holes and liquid outlet holes which are communicated with the micro-channel structure are formed in the heat sink base, the micro-channel structure is formed by pressing the heat dissipation ribs which are arranged in a staggered mode, the controllability of machining is higher, the machining difficulty is greatly reduced, the precision requirement of the machining equipment is greatly reduced, and the production cost is reduced.

The application discloses a kind of active coherent optical synthetic aperture super-resolution imaging space target monitoring systems, including active coherent light generation module, optical imaging module, image super-resolution reconstruction module, power module, motion control module and heat dissipation module.Active coherent light generation module is constituted by laser and optical phased array, optical imaging module is constituted by front end optics and surface array detector, image super-resolution reconstruction module is constituted by GPU and super-resolution reconstruction software.Laser provides light source for optical phased array, optical phased array irradiates light source to target, and front end optics receives target reflected light, and forms low-resolution image on surface array detector.Image super-resolution reconstruction module carries out pre-processing and super-resolution reconstruction to low-resolution image.Power module provides power supply for other modules.Motion control module is used to control system to realize aiming tracking, and heat dissipation module is used for laser cooling.The application can realize 4-8 times equivalent aperture super-resolution imaging.

The application discloses a liquid metal phase change cold plate low-deformation structure for heat dissipation of a laser and a use method thereof, and relates to the technical field of laser cooling. The structure comprises a distributed liquid metal heat dissipation unit, which comprises a plurality of built-in phase change material filling cavities arranged in an equidistant array, liquid metal filled in the phase change material filling cavities and used for absorbing heat, and the phase change material filling cavities are arranged behind optical elements and are completely sealed by a cold plate inside the cold plate; a phase change expansion buffer unit, which comprises a sliding cavity, a sealing sliding plate in sliding connection with the sliding cavity and used for dynamically sealing the liquid metal in the phase change material filling cavities, and a buffer spring arranged inside the sliding cavity and used for elastically supporting the sealing sliding plate. The distributed placement of the phase change material filling cavities improves the mechanical strength of the cold plate and the utilization rate of the cold plate; and the characteristics of the phase state transformation of the liquid metal are utilized, so that the technical effects of temperature equalization, temperature control and heat dissipation are achieved.

The invention belongs to the technical field of calcium carbide furnaces, and discloses a high-energy hole opening method for a calcium carbide furnace device, which comprises the steps of self-checking, parameter setting, positioning and adjusting, high-energy hole opening and ending. After self-checking and verifying the authority, starting multiple systems, completing function detection, and checking hidden dangers of equipment; setting parameters according to furnace eye and working condition information, and presetting laser, cooling and positioning parameters; after positioning adjustment and coarse positioning, the coordinates of the furnace eye are analyzed, and precise alignment and posture locking of the laser assembly are completed; a high-energy eye-opening laser and cooling system scans according to a composite track and is dynamically adjusted until eye opening succeeds; and stopping laser at the ending step, delaying cooling temperature reduction, resetting equipment and filing operation data. According to the high-energy hole opening method for the calcium carbide furnace device, through automation, laser and closed-loop control technologies, traditional manual operation and carbon rod operation are thoroughly replaced, safety risks and material consumption are fundamentally eradicated, remote, accurate and efficient hole opening is achieved, and the operation success rate and continuity are greatly improved.

The invention provides a rubidium optical pump magnetometer and a measuring method thereof, and belongs to the technical field of magnetometers, an entangled photon assembly comprises a first laser and a nonlinear optical crystal, and the nonlinear optical crystal is used for converting photons emitted by the first laser into entangled photon pairs; the rubidium atom gas chamber is used for receiving entangled photon pairs; the laser cooling system is used for cooling rubidium atoms to a Bose-Einstein condensed state; the interferometer phase detection system comprises a second laser, a first beam splitter, a beam combiner and a signal processor. According to the method, entangled photons and rubidium atoms are introduced to form a quantum entangled state, and the introduced entangled photons are coupled with a rubidium atom system to form an enhanced quantum interference effect. The measurement precision of a traditional rubidium optical pump magnetometer is restricted by quantum noise, and the measurement noise of a system is reduced by introducing entangled photons, so that higher measurement precision is realized.