Quantum squeezing enhancement based on phase-sensitive cascaded four-wave mixing processes

作     者：Yanbo Lou Yingxuan Chen Jiabin Wang Shengshuai Liu Jietai Jing 

作者机构：State Key Laboratory of Precision SpectroscopyJoint Institute of Advanced Science and TechnologySchool of Physics and Electronic ScienceEast China Normal UniversityShanghai 200062China CAS Center for Excellence in Ultra-intense Laser ScienceShanghai 201800China Collaborative Innovation Center of Extreme OpticsShanxi UniversityTaiyuan 030006China 

出 版 物：《Science China(Physics,Mechanics & Astronomy)》 (中国科学：物理学、力学、天文学（英文版）)

年 卷 期：2023年第66卷第5期

页      面：73-78页

核心收录：

学科分类：07[理学] 070201[理学-理论物理] 0702[理学-物理学] 

基　　金：supported by the National Natural Science Foundation of China(Grant Nos.12225404,11874155,91436211,11374104,and 12174110) the Innovation Program of Shanghai Municipal Education Commission(Grant No.2021-01-07-00-08-E00100) the Program of Shanghai Academic Research Leader(Grant No.22XD1400700) the Basic Research Project of Shanghai Science and Technology Commission(Grant No.20JC1416100) the Natural Science Foundation of Shanghai(Grant No.17ZR1442900) the Minhang Leading Talents(Grant No.201971) the Shanghai Sailing Program(Grant No.21YF1410800) the Natural Science Foundation of Chongqing(Grant No.CSTB2022NSCQ-MSX0893) the Shanghai Municipal Science and Technology Major Project(Grant No.2019SHZDZX01) the 111 Project(Grant No.B12024). 

主　　题：quantum optics quantum squeezing four-wave mixing 

摘      要：Quantum squeezing is an important quantum resource for quantum metrology as it can improve the measurement precision.By enhancing the quantum squeezing level,the measurement precision can be further improved.Here,we experimentally implement quantum squeezing enhancement based on phase-sensitive cascaded four-wave mixing(CFWM)processes.The intensitydifference squeezing(IDS)between the two outputs of the phase-sensitive CFWM processes is enhanced to about 7.42 dB compared with IDS generated by the single four-wave mixing(FWM)process(about 3.31 or 4.01 dB).Such enhancement is enabled by both the intrinsic interference nature of phase-sensitive CFWM processes and the contribution of more gain from the two FWM processes.In addition,we measure IDS levels generated by phase-sensitive CFWM processes at different internalphase-locking points,which shows that the internal phase plays an important role in IDS enhancement.Our scheme provides a new method for improving the degree of IDS and may find potential applications in enhancing the measurement precision in quantum metrology.