CN-122027034-A - Redberg atom communication receiving system and method based on AT split peak analysis

CN122027034ACN 122027034 ACN122027034 ACN 122027034ACN-122027034-A

Abstract

The invention relates to a Redberg atom communication receiving system and method based on AT splitting peak analysis, and belongs to the technical field of quantum communication. The system comprises a detection laser, a coupling laser, an AOM/EOM, a function generator, a high-frequency signal generator, a cesium atom gas chamber, a photoelectric detector, a lock-in amplifier, a data acquisition module and a microwave signal output module. The AOM/EOM forms modulation to the detection laser frequency, the microwave signal output module generates AM modulation microwave signal to be transmitted to cesium atom air chamber, to make target Redberg state atom generate AT splitting effect to calibrate system parameters, and the photoelectric detector and the phase-locked amplifier obtain first harmonic component based on transmitted light. During communication, the system is placed in a microwave electric field received by communication, and the data acquisition and processing module outputs and restores an AM modulation microwave signal received by the cesium atom air chamber based on calibrated system parameters and phase lock. The invention solves the problems of signal distortion and complex operation of heterodyne method in EIT-AT direct communication transmission.

Inventors

ZHENG DEZHI
Zhu Zhiao
LI ZHONGXIANG
HU CHUN
CHEN MINZE

Assignees

北京理工大学

Dates

Publication Date: 20260512
Application Date: 20251229

Claims (10)

1. A reed-burg atomic communication receiving system based on AT split peak analysis, comprising: a cesium atom air chamber for accommodating cesium atom vapor; the detection laser is used for generating detection laser; A function generator for outputting a sinusoidal signal; a modulator for receiving a sinusoidal signal and modulating the frequency of the detection laser based on the sinusoidal signal to affect the transmission spectrum; the coupling laser is used for generating coupling laser and linearly fluctuating the coupling laser frequency within a set range so as to excite cesium atoms of the cesium atom air chamber from an intermediate state to a target Redburg state to generate an electromagnetic induction transparent effect and induce transmission light intensity change; The microwave signal output module is used for generating a first AM modulation microwave signal in a debugging stage and transmitting the first AM modulation microwave signal to the cesium atom air chamber so that the target Redberg state atom generates an AT splitting effect to calibrate system parameters; the photoelectric detector is used for detecting AT split optical signals transmitted through the cesium atom air chamber and converting the AT split optical signals into corresponding electric signals; The phase-locked amplifier is used for demodulating a first harmonic component of the detection laser transmitted light from the electric signal by taking the fundamental frequency of the sinusoidal signal as a reference; and the data acquisition and processing module is used for recovering a second AM modulation microwave signal received by the cesium atom air chamber based on the calibrated system parameter and the first harmonic component during communication reception.
2. The reed-burg atom communication reception system of claim 1, further comprising: And the high-frequency signal generator is used for generating a high-frequency dithering signal and transmitting the high-frequency dithering signal to the modulator so as to inhibit nonlinear distortion of the detection laser modulation.
3. The reed-burg atom communication receiving system of claim 1 or 2, wherein the modulator is an electro-optic modulator or an acousto-optic modulator.
4. A reed-burg atom communication receiving system as claimed in claim 3, wherein the system parameters are calculated using the formula: ; Wherein, the To detect a first harmonic component of the laser transmitted light; modulating a microwave signal for AM; Is a scaling factor, i.e. the system parameter.
5. The Redberg atom communication receiving system according to claim 4, wherein in a system debugging phase, the scaling factor is obtained by performing a plurality of calculations by changing the modulation signal of the AM modulated microwave signal, fitting 。
6. The system of claim 4, wherein the detection laser has a wavelength of 852nm corresponding to cesium atoms → And (5) transition.
7. The system of claim 4, wherein the coupled laser has a wavelength of 509nm corresponding to cesium atoms → And (5) transition.
8. The system of claim 4, wherein the AM modulated microwave signal generated by the communication microwave signal output module has a frequency of a resonant transition frequency of cesium atoms.
9. The system of claim 8, wherein the AM modulated microwave signal generated by the communication microwave signal output module has a frequency of 3.221GHz.
10. A reed-burg atom communication receiving method based on AT splitting peak analysis, implemented by the reed-burg atom communication receiving system according to any one of claims 1-9, comprising a communication preparation stage and a communication receiving stage; in the communication preparation phase: exciting cesium atoms of the cesium atom cell from a ground state to an intermediate state using a detection laser in generating detection laser; Generating coupling laser by using a coupling laser, and linearly fluctuating the coupling laser frequency within a set range so as to excite cesium atoms of the cesium atom gas chamber from an intermediate state to a target Redburg state to generate an electromagnetic induction transparent effect and induce transmission light intensity change; receiving a sinusoidal signal of a function generator using a modulator and forming a modulation of a detection laser frequency based on the sinusoidal signal to affect a transmission spectrum; Generating a first AM modulation microwave signal by using a microwave signal output module, and transmitting the first AM modulation microwave signal to a cesium atom air chamber, so that an AT splitting effect is generated on a target Redberg state atom to calibrate system parameters; Detecting an AT split optical signal transmitted through the cesium atom gas cell by using a photodetector and converting the AT split optical signal into a corresponding electrical signal; demodulating a first harmonic component of the transmission light of the detection laser from the electric signal by using a lock-in amplifier with the fundamental frequency of the sinusoidal signal as a reference; in the communication receiving stage; And stopping the microwave signal output module, placing the communication receiving system in a communication microwave field, and recovering a second AM modulated microwave signal received by the cesium atom air chamber by adopting the data acquisition and processing module based on the calibrated system parameters and the first harmonic component of the detection laser transmitted light demodulated by the lock-in amplifier.

Description

Redberg atom communication receiving system and method based on AT split peak analysis Technical Field The invention relates to the technical field of quantum communication, in particular to a Redberg atomic communication receiving system and method based on AT split peak analysis. Background Because the Redberg atoms have the characteristics of high sensitivity, broad-spectrum adjustability, traceability and calibration-free for electric field measurement, the Redberg atoms have important application in the fields of quantum precision detection, radar, communication and the like. The sensor has the unique advantages in the aspect of improving the measurement sensitivity, and can detect the weak electric field change which is difficult to detect by the traditional sensor, so that high-fidelity communication signal transmission is performed. The traditional Redburg atomic electric field measurement technology is based on Electromagnetic Induction Transparency (EIT) and Autler-Townes (AT) splitting effect, obtains the interval change of splitting double peaks in a transmission spectrum through laser scanning to invert the electric field intensity, and can also utilize the AC-Stark effect to receive microwave signals by adding beat frequency signals of heterodyne method (local oscillation field is resonance signal between two energy levels) or modulation signals taking AT splitting resonance frequency signals as carrier waves to EIT peaks in the transmission spectrum. However, in practical applications, although the use of EIT signals of transmission spectrum to receive modulated signals has easy operability, the sensitivity is low, and the AT splitting height variation amplitude and the electric field intensity variation amplitude are not in a linear relationship, so that the received modulated signals are severely distorted, while the use of heterodyne methods to receive signals has high fidelity, but two microwave fields are required to transmit signals and the operation is complicated. Disclosure of Invention In view of the above analysis, the invention aims to disclose a system and a method for receiving a reed burg atomic communication based on AT splitting peak analysis, which utilize an electro-optic modulator or an acousto-optic modulator to add frequency modulation for detection laser, receive a microwave modulation signal through an AC-Stark effect and demodulate by a lock-in amplifier, analyze the amplitude of a first harmonic component of the modulation signal added by the detection light in the output of the lock-in amplifier, and calculate the microwave modulation signal, thereby solving the signal distortion problem existing in EIT-AT direct communication transmission and the complex operation problem of heterodyne method, and simultaneously effectively inhibiting laser noise. In one aspect, the present invention provides a system for receiving a reed-burg atom communication based on AT split peak analysis, which specifically includes: a cesium atom air chamber for accommodating cesium atom vapor; the detection laser is used for generating detection laser; A function generator for outputting a sinusoidal signal; a modulator for receiving a sinusoidal signal and modulating the frequency of the detection laser based on the sinusoidal signal to affect the transmission spectrum; the coupling laser is used for generating coupling laser and linearly fluctuating the coupling laser frequency within a set range so as to excite cesium atoms of the cesium atom air chamber from an intermediate state to a target Redburg state to generate an electromagnetic induction transparent effect and induce transmission light intensity change; The microwave signal output module is used for generating a first AM modulation microwave signal in a debugging stage and transmitting the first AM modulation microwave signal to the cesium atom air chamber so that the target Redberg state atom generates an AT splitting effect to calibrate system parameters; the photoelectric detector is used for detecting AT split optical signals transmitted through the cesium atom air chamber and converting the AT split optical signals into corresponding electric signals; The phase-locked amplifier is used for demodulating a first harmonic component of the detection laser transmitted light from the electric signal by taking the fundamental frequency of the sinusoidal signal as a reference; and the data acquisition and processing module is used for recovering a second AM modulation microwave signal received by the cesium atom air chamber based on the calibrated system parameter and the first harmonic component during communication reception. Further, the communication receiving system further includes: And the high-frequency signal generator is used for generating a high-frequency dithering signal and transmitting the high-frequency dithering signal to the modulator so as to inhibit nonlinear distortion of the detection laser modulation. Further