Quantum Effect Based All-Optical Space Electric Field Measurement And Research On Atomic Communication Receiver

The precise measurement of microwave electric field strength is an important field in metrology.It is an important technical means in metamaterials,micro-nano chips and electric field imaging.Accurate measurement of microwave electric field can be used to stabilize the amplitude of microwave source and determine the optical properties of fixed materials in the microwave band.Electric field strength is also one of the key quantities for radio metrology,how to meet the needs of the international metrology Conference(CGPM)to achieve the measurement of microwave electric field strength with high sensitivity,high resolution and high accuracy,and complete the final measurement method from the classical physical constant to the quantum constant has become the main research direction.Rydberg atoms are some kinds of atoms with large principal quantum numbers.Their large dc polarizabilities and microwave-transition dipole moments make them very suitable for the microwave electric field measurement.⁸⁷Rb are atomic medium in the experiment.Aiming at the problems and bottlenecks in the traditional microwave electric field measurement,we carry out the microwave electric field measurement based on Rydberg atoms,build the measurement system,optimize the experimental device,improve the precision measurement index,evaluate the standard uncertainty of the microwave electric field strength measurement at the typical frequency point,explore the new mechanism of space-time-varying electric field quantum measurement,and the exploration and research of the atomic receiver are presented.The innovation of this article is as follows:(1)Based on the EIT-AT effect of the Rydberg atoms,the microwave electric field strength measurement was completed.By optimizing the manipulation technique of the optical experiment,the sensitivity of the microwave electric field measurement was improved,and the measurement results can be directly traced to the international system of units(SI)via atomic constant.(2)The influence mechanism of microwave electric field measurement based on Rydberg atoms is studied systematically.The uncertainty sources that affect the measurement results of microwave electric field are listed and each source is analyzed.The uncertainty is evaluated according to the national measurement technical specifications,and the uncertainty report is completed.(3)Explored the possibility of Rydberg atoms as a microwave receiver for communication,and carried out related communication experiments,completed the work of receiving picture signals through amplitude modulation and frequency modulation in the microwave band.The signal-to-noise ratio,bit error rate,bandwidth,etc.were discussed in detail,and frequency spectrum multiplexing was used to save spectrum resources and optimize communication performance.