Squeezing-enhanced resolution of radio-frequency signals  

作　　者：Wei Li Mingjian Ju Qinghui Li Ruixin Li Wenxiu Yao Yimiao Wu Yajun Wang Long Tian Shaoping Shi Yaohui Zheng 李卫;鞠明健;李庆回;李瑞鑫;姚文秀;武奕淼;王雅君;田龙;史少平;郑耀辉(State Key Laboratory of Quantum Optics and Quantum Optics Devices,Institute of Opto-Electronics,Shanxi University,Taiyuan 030006,China;Collaborative Innovation Center of Extreme Optics,Shanxi University,Taiyuan 030006,China)

机构地区：[1]State Key Laboratory of Quantum Optics and Quantum Optics Devices,Institute of Opto-Electronics,Shanxi University,Taiyuan 030006,China [2]Collaborative Innovation Center of Extreme Optics,Shanxi University,Taiyuan 030006,China

出　　处：《Chinese Optics Letters》2024年第7期100-104,共5页中国光学快报（英文版）

基　　金：supported by the National Natural Science Foundation of China(Nos.62225504,12274275,62027821,U22A6003,62035015,62375162,12304399,and 12174234);the Key R&D Program of Shanxi(No.202302150101015);the Fundamental Research Program of Shanxi Province(Nos.202303021212003 and 202303021224006).

摘　　要：We demonstrate a resolution enhancement scheme of radio-frequency signals by tailoring a phase-squeezed state.The echo radio-frequency signals collected by photonic radar give rise to displacements in the phase quadrature of a probe laser and are estimated by the balanced homodyne detector.In contrast to the conventional coherent state,the noise variances for radio-frequency estimation with a squeezed state are reduced by approximately 6.9 dB.According to the Rayleigh criterion that defines the resolution limit,the minimum resolvable displacement Δa with a squeezed state is reduced to 45%compared to that with a coherent state,demonstrating the quantum advantage.The squeezing-enhanced technique has extensive applications for multitarget recognition and tracking in contemporary photonic radar systems.

关 键 词：phase-squeezed state radio-frequency signal RESOLUTION 

分 类 号：TN957.51[电子电信—信号与信息处理]