77 results about "Rydberg atom" patented technology

The invention relates to a weak electric field detection technology, particularly relates to an electric field detection method and device based on stark effects of Rydberg atoms, and solves the technical problems that the measurement on an electric field, particularly a weak electric field, is not accurate enough at present, and the sensitivity is not high enough. The electric field detection method based on the stark effects of the Rydberg atoms comprises the following steps: (a) oppositely arranging two beams of laser and collinearly emitting the laser into a sample tank which is internally filled with alkaline metal atom steam; (b) acquiring a signal of the second beam of the laser emitted out by the sample tank and converting the signal into a corresponding electric signal; and (c) analyzing the acquired electric signal, and if the electric field exists, observing an absorption spectrum with a stark cracking phenomenon from the signal, so as to further solve the intensity of the electric field E. According to the electric field detection method and device based on the stark effects of the Rydberg atoms, the electric field can be measured by the stark effects with an alkaline metal atom Rydberg energy level; the measurement precision is high and the electric field strength which is weakened to an mV / cm grade can be measured.

The invention discloses a microwave electric field intensity meter based on a cold Rydberg atom interferometer and a measuring method thereof. The microwave electric field intensity meter comprises: a vacuum system, which is used for cooling and trapping atom to generate a cold atom cloud for preparing a Rydberg state and generating an interference effect so as to generate a phase difference by coherent atomic states; a laser, which is used for generating coupling light and detection light and exciting the cold atom in the vacuum system from a ground state to the Rydberg state coherently; a photoelectric detector, which is used for detecting an interference fringe generated by two beams of cold atom clouds due to coherence; and a microwave source, which is used for generating a microwave electric field. According to the invention, when the microwave electric field intensity meter is applied to the evolution process of coherent beam splitting and combination, the atom cloud in the Rydberg state interacts with a to-be-measured microwave electric field, thereby generating an alternating-current stark effect; and the to-be-measured microwave electric field intensity is associated with a phase generated by the an alternating-current stark, thereby realizing precise measurement of the microwave electric field.

The invention discloses a microwave electric field intensity measurement method and a measurement device. The measurement method comprises the steps that coupling light and probing light generated by a laser excite clod atoms in vacuum equipment from a ground state to the Rydberg state coherently; the ground state and the Rydberg state are taken as two internal states of the Raman effect, the appropriate detuning is selected, microwaves generated by a microwave source are applied to the clod atoms, and a Raman absorption peak of the clod atoms is enabled to split; the splitting width of the Raman absorption peak is measured, and the electric field intensity of the microwave source is calculated according to the splitting width. The measurement method disclosed by the invention is based on a technology of cold Rydberg atom manipulation, utilizes the Raman effect to suppress spontaneous radiation to realize narrow-linewidth absorption peak splitting, realizes the purpose of improving the microwave electric field measurement accuracy by an order of magnitude through measuring the splitting width of the Raman absorption peak, and thus provides a new technology foundation for studying precision measurement for the microwave electric field.

The invention relates to atom laser cooling and atom laser capturing, in particular to a bi-color magneto-optical trap method and device for cooling and capturing atoms through lasers. According to the bi-color magneto-optical trap method and device, atom cooling and atom capturing are achieved through the bi-color lasers which work in a base-state, middle-excited-state and higher-excited-state cascading energy level, and atom pre-cooling is not needed. A step-type bi-color magneto-optical trap technology is adopted for the bi-color magneto-optical trap device, and the atoms can be directly cooled and captured from a vacuum air chamber. The step-type bi-color magneto-optical trap device can be used for cooling and capturing the alkali metal atoms, the alkaline earth metal atoms and even the rydberg atoms through the lasers; some quantum coherent effects can be directly researched in the cold atoms based on step-type bi-color dual-photon cooling, for example, the problem that correlation photon pairs are directly generated in bi-color magneto-optical traps is researched based on the rhombus-energy-level four-wave mixing effect; as for the experimental device, a bi-color magneto-optical trap experiment idea which is quite flexible and easy to achieve is initiated, and the experimental device can be conveniently applied and popularized.

The invention discloses a method for measuring a microwave electric field by utilizing a double-dark state system. The method is characterized in that laser provided by an external cavity semiconductor laser is split by a dichroscope into probe laser and coupling laser, and the probe laser and the coupling laser enter a rubidium atom vapor chamber in the same direction through half-wave plates and a polarization beam splitter; the two half-wave plates adjust incident light intensity of a probe laser field and a coupling laser field respectively to enable the control field >> the probe field; the probe laser is locked in a rubidium Rydberg atom 5S1 / 2 (F = 1)-5P3 / 2 transition line, and the control laser is locked in a rubidium Rydberg state atom 5S1 / 2 (F = 2)-5P3 / 2 transition line; a frequency doubling laser provides coupling laser, and adjusts the coupling laser to couple in energy level 5P3 / 2-53D5 / 2 resonance frequency; a microwave analog signal generator provides a power-adjustable microwave signal to couple transition between Rydberg atom state vectors 53D5 / 2-54P3 / 2, and thus transmission peak of EIT of Rydberg atoms splits; and a photoelectric detector detects absorption characteristics of the probe laser, and transmission peak line wide space represents electric field intensity of the microwave signal. The method can greatly narrow transmission peak line width and improve detection precision and sensitivity.

The invention discloses a Rydberg-atom-based quantum antenna amplitude modulation wave receiving device and method. An electromagnetic induction transparent spectrum with the Rydberg atom is used as adetection way and an AT split spectrum under the effect of an amplitude modulation microwave is measured, so that atom-based amplitude-modulated microwave quantum antenna and communication receiver are realized and a modulation signal is read out directly; and the traditional modulation and demodulation are realized and a defect that the traditional microwave communication receiving terminal needs a demodulation mode is overcome. The quantum antenna causes no interference on the electric field. The receiving device that is simple and is easy to realize miniaturization is suitable for wide application.

The invention discloses a device and a method for receiving a quantum antenna frequency-modulated wave based on Rydberg atoms. The device and the method have the beneficial effects that: an electromagnetically induced transparent spectrum of the Rydberg atoms is used as a detection means to measure an AT splitting spectrum under the function of frequency modulation microwaves, so as to achieve receiving of the quantum antenna frequency-modulated wave based on atoms, in this way, a quantum communication receiver can be formed, and a modulated signal can be directly read without a huge antenna and a demodulation circuit, thereby overcoming the defect that a conventional microwave communication receiving end requires the huge antenna and adopts a demodulation mode; in addition, a probe has nointerference on an electric field, the device is simple and convenient, and microminiaturization can be achieved easily, thus the device is suitable for being widely promoted.

The invention discloses a millimeter wave detection method and millimeter wave detection device, belonging to the technical field of coherent detection of millimeter wave and terahertz. The method comprises the following steps: enabling a to-be-detected microwave to irradiate on an atom sample pool, and converting millimeter wave coherence into visible light signals through six-wave mixing; measuring the visible light signals to obtain amplitude and phase of the millimeter wave, thereby realizing high-sensitivity millimeter wave coherence detection. The method and the device are based on a quantum interference principle and a Rydberg atom six-wave mixing technology, convert the millimeter wave coherence into the visible light signals in an atom air chamber, and realize high-sensitivity detection of the millimeter wave through detection of visible light; and the method can obtain the detection sensitivity approximate to single photon level, realizes millimeter wave and terahertz real-time imaging of which spatial resolution is subwavelength magnitude, and provides new technical basis for precise detection of the millimeter wave and the terahertz.

The invention relates to a radio frequency electric field correcting method and device based on a Rydberg atom quantum coherence effect, and aims to solve the technical problem that an existing electric field measuring method has large errors. According to the adopted technical scheme, a glass cesium bubble provided with a pair of parallel electrode plates is used as a cesium atom sample cell, cesium atoms form electromagnetically induced transparency under the action of probe light sent by two laser light sources and coupling light, the electromagnetically induced transparency has Stark frequency shift and split under the action of a radio frequency electric field and generates dipole sidebands at the Rydberg energy level modulated by the radio frequency electric field, multiple energy level cross points are formed in the Stark spectrum, each cross point serves as a datum point for correcting the electric field, each datum point corresponds to an accurate electric field value, and then the determined electric value is used for correcting the radio frequency electric field. The device is composed of a cesium atom sample cell, two laser light sources, a radio frequency source, a high-reflectivity reflector, a dichroic mirror and a photoelectric detector.

The invention relates to a device and method for measuring the polarization direction of a radio frequency electric field. The objective of the invention lies in solving a technical problem that a conventional radio frequency electric field polarization direction measurement device and method have a big measurement error. The technical scheme of the invention is that the device comprises a sample pool, a first laser light source, a second laser light source, a high-reflectivity reflector, a dichroic mirror, a photoelectric detector, a first half-wave plate, a first polarization splitting prism, a second half-wave plate and a second polarization splitting prism; the method achieves the measurement of the polarization direction of the radio frequency electric field through the induction of the radio-frequency decoration Rydberg atom electromagnetic induced transparency effect spectrum lines to the polarization direction of the electric field. The method carries out the measurement based on atom parameters, irons out the defect that a conventional electric field polarization direction measurement method is big in error, is very simple in implementation, and facilitates the implementation of miniaturization.

The invention relates to a microwave detection technology, particularly relates to a microwave induction method and device based on Rydberg atoms, and solves the technical problems that current equipment for microwave field detection easily disturbs a microwave field. The microwave induction method based on the Rydberg atoms comprises the following steps: (a) after combining two beams of laser and expanding the combined beams, and emitting the laser into a transparent sample tank filled with alkaline metal atom steam; (b) filtering laser which is emitted out from the sample tank and has the frequency the same as that of a second laser beam, acquiring residual laser signals and converting the laser signals into corresponding electric signals; and (c) if the microwave field exists at the position of the sample tank and signals with the reduced strength of the first beam of the laser are acquired, judging that the microwave field exists at the position of the sample tank. According to the microwave induction method and device based on the Rydberg atoms, the problems of an existing microwave induction technology that the volume is large and the detection sensitivity is low are solved. With the adoption of the microwave inductor based on the Rydberg atoms, whether the microwave field exists in the environment or not can be measured rapidly and accurately.

System and method for producing thermal energy is based on a very large number of nanoscale particle accelerators in a volume accelerating electrons and hydrogen ions at very high local electric fields. Nanoscale particle accelerators comprise a dielectric material possessing electric polarizability and a metallic material capable of forming an interstitial and / or electrically conductive metal hydride and capable of enhancing the local electric field by the geometry and / or by the sufficiently small dimensions of the said metallic material. Low to medium strength local electric fields are utilized for the generation of Rydberg matter and inverted Rydberg matter in the presence of a material capable of forming and storing Rydberg atoms. Destabilization of Rydberg matter and inverted Rydberg matter leads to solid state physical reactions that release energy.

The invention relates to a microwave power measuring device and a measuring method based on the Rydberg atom quantum coherence effect. A low electromagnetic perturbation atom air chamber equipped with helium vapor is placed in a guided wave system. Two lasers are used to excite ground state rubidium atoms to the Rydberg state. Based on the quantum effect, the measurement of the guided wave electric field is converted into the measurement of the atomic absorption spectrum. The analytical and quantitative relationship between power and the guided wave electric field is used to achieve microwave power measurement traceable to Planck constants. The measuring method provided by the invention has the advantages of high sensitivity, large dynamic range, small measurement uncertainty and the like.

The invention discloses a nanoscale microwave magnetic field measurement method. The nanoscale microwave magnetic field measurement method can calculate the amplitude and the frequency of a microwavemagnetic field by measuring the BS translation amount and combining the set sequence, and the measurement range of the frequency is from 100 MHz to 5 GHz. Compared with a previous measurement method which uses coils, Rydberg atoms and superconducting coils, the nanoscale microwave magnetic field measurement method has nanoscale spatial resolution and higher precision, and can perform measurement at mild conditions, such as room temperature and atmosphere. Compared with a method of measuring amicrowave magnetic field by using Rabi oscillation based on the NV color center, the nanoscale microwave magnetic field measurement method does not require the condition of resonance, can measure the amplitude and the frequency of the microwave magnetic field at the same time, and has a very high bandwidth. The nanoscale microwave magnetic field measurement method has flexibility and universality, is suitable for the color center system, and can also be applied to other systems, such as cold atoms.Therefore, the nanoscale microwave magnetic field measurement method has many latent applications.

The invention discloses a wireless digital communication receiving antenna based on microwave optical wave coherent conversion and a method thereof. wherein the communication receiving antenna comprises a laser,a digital signal modulator, a cesium bubble and beam combiner. a photoelectric detector and a digital signal demodulator, wherein the laser is used for generating local oscillation light required in optical heterodyne detection; wherein the digital signal demodulator modulates a digital signal to microwaves, the cesium bulb modulates and converts the microwaves into modulated light waves, the beam combiner superposes local oscillation light and the modulated light waves to generate an optical heterodyne signal, the photoelectric detector receives the optical heterodyne signal, and the digital signal demodulator is used for recovering the optical heterodyne signal to the digital signal. Coherent conversion of microwaves and light waves in the Rydberg atom six-wave mixing processis utilized, phase modulation of a digital signal on the microwaves is converted into phase modulation on the light waves, coherent demodulation is conducted on the modulated light waves through an optical heterodyne demodulation method to recover the digital signal, and therefore digital communication is achieved.

The invention discloses an optical carrier wireless communication system and method based on Rydberg atom six-wave mixing. The system comprises a cesium bubble, a microwave source, a signal generator,a signal modulator, an optical fiber, a photoelectric detector and a signal amplifier; the microwave source generates microwaves, the signal generator generates baseband signals, and the signal modulator is used for modulating the baseband signals to the microwaves to generate modulated microwaves; the cesium bubble converts the modulated microwaves into modulated light waves; the photoelectric detector is used for receiving the modulated light wave; and the signal amplifier is used for amplifying the electric signal output by the photoelectric detector. According to the optical carrier wireless communication system provided by the invention, the coherent conversion of microwaves and light waves in a Rydberg atom six-wave mixing process is utilized; amplitude modulation of microwave by baseband signals is converted into amplitude modulation of light waves, the modulated light waves are transmitted through an optical fiber, finally, the modulated light waves are received through a photoelectric detector, demodulation is not needed, the baseband signals are directly obtained, and therefore the radio over fiber communication technology is achieved.

The invention discloses a wide-frequency light absorption method utilizing microwave-assisted Rydberg atoms. The method comprises the specific steps of providing a beam of laser as detection light, entering a rubidium vapor pool, and coupling the detection light to rubidium atom ground state transition; in addition, providing a beam of coupled light opposite to the detection light, and reversely entering the rubidium vapor pool; adjusting the coupled light to be locked in rubidium atom Rydberg state transition for resonance coupling; forming an electromagnetic induction transparent window by the rubidium atom ground state transition and Rydberg state transition, wherein a transmission peak occurs; coupling microwave signals to the rubidium atom Rydberg state transition; splitting the transmission peak, wherein a transmission spectrum of the detection light has a bandwidth-adjustable wide-frequency absorption characteristic; and receiving a detection light signal by using a photoelectric detector, thereby obtaining an absorption spectrum line of the detection light. The method disclosed by the invention works under the conditions of room temperature and normal atmospheric pressure,and is relatively low in cost, simple and convenient to operate and suitable for large-scale production and use.

This invention disclosed a high efficiency detection method for alkaline earth ions. Three dye laser wares were activated by a Nd:YAG laser ware, alkaline earth atomic beam was illuminated by two dye laser wares to produce atom samples with different n, l value; ionizate the atom by the third dye laser wares. This invention has high efficiency no matter whether the n value of Rydberg atom was high. It improved the bug of traditional method and could be applied to every kind of alkaline earth atom.

One aspect of the disclosure provides a method of mass spectrometric analysis that includes producing either glow discharge within a noble gas between 3-100 mBar pressure, sampling and conditioning glow discharge products within a gas flow through a conductive channel (55), removing charged particles while transferring excited Ridberg atoms, and mixing conditioned discharge products with analyte flow within an enclosed chamber at elevated temperatures above 150 DEG Celsius for producing a Penning reaction between analyte molecules and Ridberg atoms. The method further includes sampling, by a gas flow, said analyte ions for mass spectrometric analysis, and at least one of the following steps: (i) removing charge within said conditioning channel (55); (ii) coaxially mixing of analyte flow with the flow of conditioned plasma; and (iii) cooling of the mixed flow within a sonic or supersonic jet for reducing the region of Penning ionization to cold jet.

The invention relates to an angle measuring device, in particular to an angle measuring device and method based on the Rydberg atom EIT effect, and belongs to the crossing field of quantum optics andmicrowave electric field measurement. The system comprises a detection laser, a coupling laser, a first spectroscope, a second spectroscope, a first reflector, a second reflector, a third reflector, afirst atomic vapor bubble, a second atomic vapor bubble, a first local oscillator microwave source, a second local oscillator microwave source, a first dichroic mirror, a second dichroic mirror, a first photoelectric detector, a second photoelectric detector and a phase comparator. The system has the advantages that the angle obtained through measurement and the relative phase difference betweenthe microwave signals received by the first atom steam bubble and the second atom steam bubble are in linear relation, and the angle measurement precision based on the EIT effect of Rydberg atoms is expected to be further improved; and 2, the system has relatively good anti-interference capability.

The invention discloses a device and a method for measuring the intensity of a continuous frequency microwave electric field based on a Rydberg atom AC Stark effect, a cesium atom steam pool is used as an atom sample pool, cesium atoms are excited to a Rydberg state under the action of detection light and coupling light emitted by two laser light sources, an electromagnetic induction transparent spectrum is generated, and the intensity of the continuous frequency microwave electric field is measured. Meanwhile, a strong electric field is used as a local field EL, the Rydberg energy level is subjected to AC Stark frequency shift and splitting, the energy level frequency shift of the Rydberg atoms is shifted to the position with the large polarizability through the AC Stark frequency shift, the induction sensitivity of the atoms to the electric field can be greatly improved, then a to-be-measured signal electric field ES is applied, the difference delta f between the frequency of the signal electric field and the frequency of the local field is smaller than 10 MHz, and the frequency of the to-be-measured signal electric field ES is smaller than 10 MHz. At the moment, the Rydberg atom serves as a frequency converter, a difference frequency signal delta f of a local field and a signal field is directly read out, the size of the difference frequency signal is in direct proportion to the ELS, the size of the signal field ES can be directly read out according to the size of the difference frequency signal, and the problem that a traditional microwave electric field measuring method is large in error is solved.

The invention provides a Rydberg atomic pull ratio oscillation device and method. The method comprises the following steps: S1, respectively opening detection light and coupling light to excite atomsfrom a ground state to a Rydberg atomic state through the Rydberg atomic pull ratio oscillation device; S2, adiabatically turning off the coupling light and waiting for a time interval; and S3, opening the coupling light, enabling the atoms to jump to an excited state, and enabling the excited state to jump to a ground state and emit a photon under the influence of the storage time in the step S2.The Rydberg atom single-photon preparation and high-fidelity multi-photon detection prepared by the invention have the effects superior to those of common atoms, and have broad application prospectsin the field of quantum communication.

The invention relates to a radar speed measurement system and method based on a Rydberg atom electromagnetic induction transparency effect. The system comprises a transmitting antenna and an atom receiving antenna used for replacing a traditional metal receiving antenna. The transmitting antenna transmits microwaves, and the microwaves are scattered by a moving object to be subjected to speed measurement to generate Doppler frequency shift to cause detuning, so that speed information of the moving object to be subjected to speed measurement is carried; the atom receiving antenna provides alkali metal atoms and generates an EIT effect in a Rydberg state, and an EIT transmission peak appears; and the atom receiving antenna is used for receiving the detuned microwaves, so that the EIT transmission peak is split, and the speed information of the moving object to be subjected to speed measurement is obtained according to the split distance of the two peaks. According to the invention, the detection sensitivity can be improved, the frequency response range is expanded, the influence of thermal noise is avoided, and miniaturization and integration are easy.

The invention discloses a superconducting quantum bit and Rydberg atom quantum state transfer method and a superconducting quantum bit and Rydberg atom quantum state transfer device. The superconducting quantum bit and Rydberg atom quantum state transfer method comprises the following steps of: S1, coupling a first superconducting quantum bit of a 50mK refrigeration platform with a superconductingtransmission line cavity of which the two ends are respectively and thermally anchored on the 50mK refrigeration platform and a 1K or 4K refrigeration platform; S2, the superconducting transmission line cavity is coupled with a superconducting planar waveguide cavity or a superconducting planar LC resonant cavity of a 1K or 4K refrigeration platform; S3, coupling a superconducting planar waveguide cavity or a superconducting planar LC resonant cavity of the 1K or 4K refrigeration platform with Rydberg atoms; and S4, extracting a number of hot photons in a coupled cavity system consisting of the superconducting transmission line cavity and the superconducting planar waveguide cavity or the superconducting planar LC resonant cavity by utilizing a second superconducting quantum bit. According to the superconducting quantum bit and Rydberg atom quantum state transfer method, quantum state transfer from superconducting quantum bits of different refrigeration platforms to Rydberg atoms is realized, the influence of hot photons in a coupled cavity system on quantum state transfer is broken through, and high-fidelity quantum state transfer from superconducting quantum bits to Rydberg atoms is realized.

The invention relates to an all-optical switching technology, in particular to an all-optical single photon switching method and device based on the Rydberg atom strong interaction effect. The method comprises the following steps that a, some alkali metal atoms are added into a single mode fiber medium; b, laser light emitted by a single photon exciting light source is coupled to a single mode fiber; c, laser light emitted by a laser light source is coupled to the single mode fiber, and the light emitted by the laser light source meets the condition of alkali metal Rydberg atom three-level system electromagnetic induced transparency; d, when an optical switch is turned off, the laser light emitted by the laser light source meets the condition of alkali metal atom three-level system electromagnetic induced transparency, and laser light can pass through the single mode fiber to form a path; when the optical switch is turned on, Rydberg atoms are prepared in the fiber medium through the single photon exciting light source, the condition of alkali metal atom three-level system electromagnetic induced transparency is damaged, and the laser light emitted by the laser light source is strongly absorbed by alkali metal atoms to form an open circuit.

The invention belongs to the crossing field of optical metamaterials and microwave electric field measurement, and particularly relates to a portable microwave electric field measuring device based onRydberg atoms. The portable microwave electric field measuring device comprises a first laser, a first optical fiber polarizer, a first optical fiber interface, a first GRIN lens, a second laser, a second optical fiber polarizer, a second optical fiber interface, a second GRIN lens, a metasurface structure, a photoelectric detector and a vacuum alkali metal atom air chamber. The portable microwave electric field measuring device has the advantages that the integration and miniaturization of the atom air chamber are realized; an all-dielectric material is used for design, so that the measurement precision is improved; during measurement, an optical path does not need to be adjusted, and an optical fiber is connected, so that the portable microwave electric field measuring device is very convenient to use, small in size, convenient to place and suitable for various complex environments; and the optical fiber is used for transmitting light, the limitation of the laser is eliminated, theportability of the atomic gas chamber is realized, and the practicability of the system is greatly improved.

The invention discloses a high-voltage power frequency voltage measurement method and device based on the Stark effect. The method includes the following steps: S1, setting m sensors for measuring theelectric field intensity of corresponding height according to the Stark effect in a line space with a height of x from the ground, and measuring the electric field values Esn corresponding to the sensors Sn; S2, calculating the average electric field value Ex according to the electric field values Esn; S3, selecting a number of height values Xi in the vertical direction of a transmission line, and calculating the measured electric field intensity values Exi corresponding to different height values according to the average electric field value Ex; and S4, calculating the voltage of the transmission line according to the measured electric field intensity values Exi. According to the invention, the spatial electric field intensity is measured by using cesium atoms excited to a high Rydberg state and utilizing the Stark effect of Rydberg atoms producing energy level splitting under the action of an external electric field according to the relationship between the degree of atomic energy level splitting and the intensity of the external electric field. High-voltage power frequency measurement of a transmission line and substation environment is realized. Non-contact voltage measurementis realized based on the method.

The invention relates to the field of laser spectrum and the field of quantum optics, in particular to a Rydberg atom phase noise spectrum generation device and method capable of measuring microwaves. In the device, detection light emitted by a detection light source enters an atomic gas chamber after passing through a first dichroic mirror, and coupling light emitted by a coupling light source is subjected to phase modulation by an electro-optic phase modulator to increase phase noise, then passes through a second dichroic mirror, is reversely overlapped with the detection light and enters the atomic gas chamber; the detection light transmitted by the atomic gas chamber enters a detector after passing through a second dichroic mirror, and the detector performs photoelectric conversion to output an electric signal to a spectrum analyzer; and the spectrum analyzer is used for analyzing the Rydberg atom phase noise spectrum at the phase modulation frequency. Through phase noise modulation of the laser system, the Rydberg spectrum can be obtained in the MHz analysis frequency band, the signal-to-noise ratio of the Rydberg atomic spectrum is improved, interference of low-frequency noise can be avoided, and quantum enhancement measurement of an electromagnetic field is allowed to be achieved through quantum light sources such as compressed light.

The invention discloses a laser intensity stability control device and method for a Rydberg atom microwave electric field intensity meter. An electro-optical liquid crystal retarder is used for realizing stable control on the light intensity of coupling light and detection light of the Rydberg atom microwave electric field intensity meter, so that the measuring precision of the Rydberg atom microwave electric field intensity meter is improved. According to the method, the laser intensity stability of the Rydberg atom microwave electric field intensity meter is improved; the integration of a laser system is facilitated; and the method is clear in principle, simple in structure and easy to implement and apply.

The invention discloses a design method of an ultra-low noise radio frequency receiver based on Rydberg atomic transition. A Rydberg steam pool is additionally arranged at the front end of a radio frequency antenna of a traditional receiver, particles in the Rydberg steam pool are excited by laser, particles at different energy levels are migrated, and therefore radio frequency signals are amplified and then received by the traditional radio frequency antenna to enter the receiver. Two Rydberg energy levels are included in the amplification process; high-energy-level Rydberg atoms are excitedby radio frequency signals to generate stimulated radiation, electrons are bound to transit from a high-energy-level Rydberg state to a low-energy-level Rydberg state, a microwave photon with the frequency, polarization and phase information the same as those of the input microwave photon is released, and therefore amplification of weak microwave signals can be achieved. The radio frequency receiver is not limited by resistance thermal noise, and the problem that a traditional radio frequency receiver cannot receive power which is low in specific heat noise is solved.