27 results about "Rydberg atom" patented technology

This invention discloses a weak micro-Doppler detection system for Rydberg atoms using isotropic idler light, belonging to the field of electromagnetic measurement technology. It includes a light pair generation module for acquiring initial light source parameters, injecting pump light and coupling light to generate quantum correlated light pairs; an information loading module for emitting probe light to generate modulated coupling light; a coherent detection module for demodulating the modulated coupling light and isotropic idler light to generate a difference-frequency electrical signal; a parameter tuning module for extracting signal quality indicators and light source quality indicators, tuning the current light source parameters, and generating updated light source parameters; and a spectrum analysis module for analyzing the difference-frequency electrical signal to obtain micro-Doppler characteristics. This invention employs a combined technical solution of quantum correlated light pair generation, Rydberg atom information loading, coherent detection, and closed-loop tuning, which can generate a difference-frequency electrical signal with a high signal-to-noise ratio, and achieve high-sensitivity measurement of the micro-Doppler characteristics of weak targets through spectrum analysis.

This invention discloses a noise reduction method for electromagnetic measurements of Rydberg atoms. This method constructs a 509nm coupled optical closed-loop circulation system comprising a polarization beam splitter, a half-wave plate, and a high-reflection mirror. This enables multiple reciprocating propagations of the laser within the atomic gas chamber. Utilizing the optical path circulation mechanism, the coupling strength between light and atoms is significantly improved without increasing the laser source power, thus greatly enhancing the excitation efficiency of Rydberg states. Simultaneously, this structure allows the intermediate frequency carrier signal to linearly and coherently superimpose with the number of cycles, while the laser background noise accumulates incoherently only according to a square root law, thereby significantly improving the measurement signal-to-noise ratio. This invention solves the problems of low excitation efficiency and difficulty in eliminating laser background noise in existing single-path optical systems, providing a new solution with high excitation efficiency and high signal-to-noise ratio for high-sensitivity microwave electric field measurements.

The present application relates to the technical field of quantum precision measurement, in particular to a Roland C signal receiving method and system based on Rydberg atoms, which utilizes atomic antennas to prepare Rydberg atoms in an alkali metal atom gas chamber to obtain an electromagnetically induced transparency (EIT) spectrum; a Roland C signal reaches the alkali metal atom gas chamber through free space, and the EIT spectrum produces an oscillation peak by utilizing the Stark effect of the Rydberg atoms; the coupling laser frequency is locked to the maximum position of the oscillation peak amplitude; by applying a direct current bias voltage to the parallel electrodes built in the alkali metal atom gas chamber, on the one hand, the received Roland C signal is corrected, and on the other hand, the alternating current Stark effect is amplified, so that the receiving sensitivity of the Roland C signal is significantly improved.

This invention relates to the field of microwave detection technology, specifically to a broadband microwave rapid detection method based on atomic level electric field tuning, which mainly solves the problem of detection limitations in traditional Rydberg atom-based microwave information detection. The broadband microwave rapid detection method based on atomic level electric field tuning includes the following steps: 1) First, a probe light and a coupling light are applied sequentially to a Rydberg atom gas cell, and then the microwave to be measured is applied to the Rydberg atom gas cell; 2) A spatial gradient radio frequency electric field is applied within the Rydberg atom gas cell; 3) The spot of the probe light is projected into an optical camera to form an image set, the pixel signals within the image set are merged, and the splitting response of the EIT-AT spectrum is observed. The electric field strength and frequency of the microwave to be measured are calculated. This invention's detection method achieves the requirement for rapid detection of random microwave signals over a wide frequency range.

This application discloses a high-precision microwave frequency measurement method and system based on continuous-time crystal phase transitions, belonging to the field of quantum sensing technology. This method utilizes the characteristic of the Rydberg atom system at the critical point of a continuous-time crystal phase transition where the response slope of the detected light transmission signal to the microwave frequency is significantly enhanced, breaking through the resolution limit of traditional linear responses. The system includes a quantum sensing unit, an optical excitation and detection module, a microwave modulation and scanning module, an auxiliary radio frequency field module, and a signal processing and control center. By precisely adjusting the parameters, the system is driven to the vicinity of the critical point, the critical frequency is identified, and its high response slope is used to achieve precise frequency measurement. This invention employs a two-stage measurement process, balancing wide dynamic range and high precision, and can be flexibly tuned to adapt to different frequency bands, possessing broad application prospects, especially in microwave communication, frequency metrology, and other fields with significant technical value.

The application discloses a Rydberg atom electric field sensing device and system, and is applied to the field of quantum sensing.The device comprises an atom chamber, a first distributed feedback laser and a second distributed feedback laser.The first distributed feedback laser and the second distributed feedback laser each comprise a laser source resonant cavity formed inside.The first distributed feedback laser and the second distributed feedback laser generate laser based on optical feedback and optical amplification of the laser source resonant cavity inside each of them, and the laser is used as probe light and pump light respectively, and enters from one side of the atom chamber, so that the atoms in the atom chamber reach the excited state and the Rydberg state in turn.The application uses the distributed feedback laser as the pump light and the probe light for exciting the Rydberg atom, provides a miniaturized light source for the Rydberg atom electric field sensing device, improves the integration of the device, has the advantages of miniaturization, is easy to move, is suitable for a harsh outdoor environment, and can realize large-scale integration of chips.

The present disclosure relates to a method and device for the tomography of a Rydberg atom graph using a location-adjustable ancilla qubit. The method and device may be configured to prepare at least one ancilla qubit around a Rydberg atom graph of interest having at least one atom, measure interactions between the Rydberg atom graph and the ancilla qubit while adjusting a location of the ancilla qubit around the Rydberg atom graph, and reconstruct a quantum state of the Rydberg atom graph based on the measured interactions.

This invention discloses a holographic measurement method for low-frequency AC electric fields based on Rydberg atoms, belonging to the field of Rydberg atom measurement and electric field measurement. The method includes: establishing a relationship model between light intensity and electric field strength based on the light intensity of probe light transmitted through an atomic gas cell under different field strengths; identifying the critical inflection point representing the light intensity saturation state in the light intensity curve, and determining the saturation region based on the critical inflection point; removing the saturation region from the light intensity curve to obtain an effective light intensity dataset; obtaining the electric field strength corresponding to each effective light intensity data using the relationship model between light intensity and electric field strength based on the effective light intensity dataset; and performing sinusoidal data fitting on the electric field strength corresponding to each effective light intensity data, extracting the amplitude, frequency, and phase of the sinusoidal quantity from the fitted field strength function. This invention solves the problem that existing methods cannot obtain the amplitude, frequency, and phase information of sinusoidal signals when measuring low-frequency electric fields in power systems.

This invention relates to a velocity measurement device based on the transient electromagnetic induction transparency effect. It utilizes two probe beams and two coupling beams to excite atoms in an atomic antenna to the Rydberg state. The probe beams are modulated into pulsed lasers to obtain the transient electromagnetic induction transparency signal of the Rydberg atoms. A first radio frequency signal source radiates electromagnetic waves to illuminate the target object; the reflected electromagnetic waves and the local oscillator electromagnetic waves radiated by a second radio frequency signal source simultaneously act on the Rydberg atoms at near-resonance. The velocity of the target object is measured by quantum precision measurement of the difference frequency signal generated by the interference of the two electromagnetic waves. Compared to traditional Rydberg atomic antennas, this invention's velocity measurement device based on the transient electromagnetic induction transparency effect can achieve velocity measurement of moving targets based on ultra-wideband, miniaturized quantum detection, thus expanding the functionality of Rydberg atomic antennas.

This invention provides a broadband atomic terahertz detection method and apparatus, relating to the field of terahertz detection and imaging technology. The method includes: generating a time-coded sequence using an arbitrary waveform generator; controlling a microwave switch to perform orthogonal coding modulation on a terahertz field to generate a terahertz differential signal carrying coded information; applying the terahertz differential signal to Rydberg atoms in an atomic gas cell to convert terahertz information into changes in the transmitted light intensity of the probe light, and converting the optical signal into an electrical signal; synchronously demodulating and acquiring the electrical signal to generate a measurement vector; and reconstructing the original terahertz time-domain waveform from the measurement vector using a compressed sensing reconstruction algorithm. This invention, by combining superheterodyne detection and time-domain computational imaging algorithms, overcomes the physical limitations of the bandwidth of atomic detectors, achieving rapid and high-resolution detection of broadband terahertz signals while maintaining their high sensitivity advantages.

This invention discloses a method for measuring Rydberg atoms using micro-Doppler agility under a polarization-multiplexed microwave field, belonging to the field of quantum precision measurement technology. The method includes generating a dynamic coded sequence and an interleaved coded microwave field by aperiodically pairing and jumping the microwave polarization state with the carrier frequency; acquiring the target echo signal and applying it to the Rydberg atom ensemble with a reference microwave field to generate a quantum coherent state; applying a synchronous laser pulse to acquire a time-series optical response signal; obtaining the signal's fundamental frequency, envelope spectrum, and initial phase component through time-frequency transformation and feature separation; and performing parameter mapping and synthesis to generate three-dimensional micro-motion parameters. This invention uses an aperiodically agile polarization-frequency-multiplexed microwave field for active target detection and utilizes the Rydberg atom ensemble for quantum coherent detection and optical readout of the echo signal, enabling high-sensitivity, high-precision, and high-anti-interference measurement of the target's three-dimensional micro-motion parameters.

The application discloses a method, system and detection device for detecting partial discharge signals by using Rydberg atoms, and the method comprises the following steps: preparing Rydberg atoms in a cesium atom vapor chamber; receiving an optical signal by a photoelectric detector; obtaining an electromagnetically induced transparency spectrum and taking the spectrum as an electromagnetically induced transparency background spectrum; placing a propagation direction of a to-be-detected signal perpendicular to a laser propagation direction in the cesium atom vapor chamber; preparing Rydberg atoms in the cesium atom vapor chamber again; receiving an electromagnetically induced transparency spectrum under the influence of the to-be-detected signal by the photoelectric detector and taking the spectrum as a to-be-detected electromagnetically induced transparency spectrum; comparing the to-be-detected electromagnetically induced transparency spectrum with the electromagnetically induced transparency background spectrum; if a signal peak exists in the spectrum, it is indicated that the to-be-detected signal exists in partial discharge; and if the signal peak does not exist, it is indicated that the to-be-detected signal does not exist in partial discharge.

This application discloses a method and apparatus for partial discharge detection based on Rydberg atoms, relating to the field of partial discharge detection technology for power equipment. This application includes an optical field adjustment module surrounding an atomic gas chamber, comprising a phase delay element, a polarization element, and a drive adjustment mechanism. The drive adjustment mechanism dynamically adjusts the rotation angles of the phase delay element and the polarization element in real time, dynamically adjusting the polarization state and relative phase of the probe light and coupling light incident on the optical field adjustment module. The probe light and coupling light, processed by the optical field adjustment module, are then injected into an atomic gas chamber filled with alkali metal atoms, causing the alkali metal atoms to transition from their ground state to the Rydberg state and couple with the pulsed electric field generated by the partial discharge of the device under test. Partial discharge characteristic parameters are obtained through photoelectric detection and calculation. The technical solution disclosed in this application can dynamically calibrate optical field parameters in real time, ensuring detection accuracy and meeting the needs of long-term online monitoring in industrial settings.

This invention relates to the fields of quantum electromagnetic measurement and radar direction finding, specifically to a sum-difference beam direction finding method and system based on Rydberg atoms. The method includes: establishing a Rydberg atom gas cell; introducing the target signal field and two local oscillator fields into the Rydberg atom gas cell; adjusting the phase difference between the two local oscillator fields so that the two local oscillator fields and the target signal field are superimposed within the Rydberg atom gas cell to form a spatial interference field; generating a difference frequency signal in the Rydberg atom gas cell based on the interaction between the target signal field and the local oscillator fields; extracting the amplitude and phase information of the difference frequency signal; establishing a mapping relationship between the angle and the sum-difference amplitude ratio; and determining the incident direction of the target signal field by combining the phase information corresponding to the difference beam. This invention is used to achieve high-precision angle measurement, improve the performance bottleneck of traditional radar angle measurement, and expand the application boundaries of Rydberg atom electric field meters.

This invention relates to a method and system for measuring the electric field of Rydberg atoms based on frequency-modulated spectroscopy. In the measurement preparation stage, a sinusoidal signal is used to modulate a coupled laser or a probe laser to induce a change in the intensity of transmitted light under induced transparency (EIT) conditions. A calibration microwave electric field is injected into the atomic gas cell, triggering an AT splitting effect in the transmitted light. The change in the intensity of the transmitted light passing through the atomic gas cell is detected, and the corresponding electrical signal is output. The signal component related to the calibration microwave electric field intensity is extracted from the electrical signal. The proportionality coefficient between the signal component and the calibration microwave electric field intensity is calculated. In the actual measurement stage, the microwave electric field to be measured is injected into the atomic gas cell, and the amplitude of the microwave electric field to be measured is calculated based on the proportionality coefficient and the signal component related to the intensity of the microwave electric field to be measured. This invention solves the problems of low sensitivity and low sampling rate in traditional EIT-AT readouts, improves measurement sensitivity, and effectively suppresses laser noise.

This invention discloses a method for extracting EIT-Stark spectral features of Rydberg atoms, comprising the following steps: A signal acquisition module acquires the initial EIT-Stark spectral signal, performs wavelet transform, calculates wavelet coefficients, and plots a two-dimensional image of the wavelet coefficients; the wavelet coefficients of the EIT-Stark spectral signal undergo a natural logarithmic transform and are classified, the inter-class variance of the two classes of wavelet coefficients is calculated, an optimization objective function is established, and the peak search range is obtained using the optimization objective function; within the peak search range, the local maximum values ​​of the wavelet coefficients are obtained through a sliding window with a fixed step size, and the corresponding local maximum values ​​at adjacent scales are connected to obtain ridge lines; based on the position of the maximum wavelet coefficient value at any scale on the ridge line, the centroid position of the spectral peak of the EIT-Stark spectral signal is obtained. This method achieves accurate, automatic, and real-time extraction of transmission peak positions and movement features, providing a reliable data foundation for electric field measurement and promoting the engineering application of electric field measurement based on the EIT-Stark effect.

The application provides a miniaturized cold Rydberg atom antenna device and a noise double-mode suppression method, relates to the technical field of quantum information, and vacuum compatible integrated atom source modules maintain the vacuum degree of a glass vacuum cavity through outgassing sheets and getter sheets; a low-temperature magnetic optical trap can cool atomic gas and gather the cold atomic gas into an F-P cavity; a Rydberg atom detection module can use coupling light to excite atoms to a Rydberg state, use detection light to detect information when cold Rydberg state atoms are split by EIT-AT after a microwave electric field is applied, and generate a main detection signal; an F-P cavity fluorescence suppression module can collect fluorescence emitted by cold Rydberg state atoms and generate a fluorescence noise signal; and a signal processing module can eliminate fluorescence noise based on the main detection signal and the fluorescence noise signal. Through the above mode, the problems that a Rydberg atom antenna device based on cold atoms is large in size and difficult to suppress fluorescence noise are solved, and the detection performance of the device can be improved.

The application provides a microwave detection device and method for fiber integrated Rydberg atoms, which comprises an optical excitation module, a bubble echo-wall microcavity, a microwave coupling module, a light splitting module, a signal conditioning module and a main control module; a tapered optical fiber is used to couple the near field of the combined light formed by the detection light and the coupling light into the bubble microcavity, so that the combined light field circulates and propagates in the echo-wall mode and fully interacts with the alkali metal atom vapor to excite a stable EIT spectrum; the microwave coupling module is used to converge the microwave to be detected into the bubble microcavity, and resonates with the atoms in the Rydberg state in the bubble microcavity to induce energy level splitting, so as to modulate the light field transmittance; the signal conditioning module is used to convert the transmitted light led out by the tapered optical fiber from an optical signal into an electrical signal, and extract the spectral characteristics of the microwave to be detected from the electrical signal; and the main control module is used to determine the microwave parameters of the microwave to be detected based on the spectral characteristics. The application improves the detection stability and detection sensitivity of the microwave detection device.

This invention provides an overvoltage quantum detection system and method for Rydberg atom antenna combined electrical appliances, relating to the field of overvoltage condition detection technology for power equipment. The detection system includes: a main control device, a transmission optical fiber, and multiple overvoltage Rydberg sensors; wherein, the main control device is used to generate detection and coupling lasers; the transmission optical fiber connects the main control device and the overvoltage Rydberg sensors, and is used to transmit the detection and coupling lasers; the multiple overvoltage Rydberg sensors are arranged in a three-half wiring configuration at each T-shaped connection point of the combined electrical appliance under test, and are used to sense the internal electric field signal of the combined electrical appliance under test based on the electromagnetically induced transparency effect of Rydberg atoms and the Autler-Townes splitting phenomenon; the main control device is also used to determine the fault location of the combined electrical appliance under overvoltage conditions based on the internal electric field signal sensed by the multiple overvoltage Rydberg sensors and the sensing time. This invention improves the accuracy of overvoltage fault location.

This invention relates to the field of quantum control technology, specifically disclosing a device for generating chaos in a multi-cluster Rydberg atomic ensemble based on radio frequency (RF) control. Using a multi-cluster Rydberg atomic ensemble as the working medium, the device achieves controllable excitation and observation of chaotic phases by controlling the interactions between atoms through an RF field. First, a spatially controllable multi-cluster Rydberg atomic ensemble is prepared using two-photon excitation. Second, a control signal with a specific frequency and voltage is applied through the RF field to induce interactions between the atomic ensembles into a nonlinear region. Finally, the acquired signals are analyzed to observe the emergent characteristics of the chaotic phase. This invention overcomes the limitation that a single-cluster atomic ensemble cannot generate chaos, enabling the observation of dynamic transitions from a time-crystalline phase to a chaotic phase in a three-cluster Rydberg atomic system, providing a new platform for quantum encrypted communication and the study of complex dynamics.

This application discloses a Rydberg atom electric field readout system and method based on weak measurement technology. A readout architecture combining Rydberg atom electric field sensing and optical weak measurement is constructed. Specifically, a weak measurement readout link is established by a pre-selection module and a post-selection module, enabling coordinated setting of the pre-selection and post-selection states. The probe light and coupling light act together on the Rydberg atomic vapor cell, allowing the atomic energy level response within the Rydberg atomic vapor cell induced by the measured electric field to be mapped as a change in optical field polarization. This effectively suppresses technical noise introduced during measurement and amplifies the signal using weak measurement technology. Therefore, the system's detection sensitivity to the electric field is improved, and the readout accuracy of the electric field signal is significantly enhanced.

This invention discloses a direction finding method and system based on Rydberg atoms. The method includes: establishing a trapezoidal electromagnetic induction transparent working state within a Rydberg atom gas chamber using probe light and coupling light; arranging a cross-shaped optical path within the Rydberg atom gas chamber to form two independent optical readout channels; introducing a common local oscillator microwave field to form a stable reference phase distribution within the Rydberg atom gas chamber; establishing a calibration dataset corresponding to the dual-channel angles; establishing a mapping function between the incident azimuth angle and the amplitude comparison quantity based on the calibration dataset; acquiring the output amplitudes of the first and second channels in real time when the azimuth angle of the electromagnetic wave to be measured is unknown, and calculating the real-time amplitude comparison quantity; and calculating the azimuth angle estimate based on the real-time amplitude comparison quantity and the mapping function between the incident azimuth angle and the amplitude comparison quantity. This invention provides a new direction finding implementation method, improving the direction sensing capability for weak signals.