Reversible Optical Isolators and Quasi-Circulators Using a Magneto-Optical Fabry-Pérot Cavity  

作　　者：张天天 周文鹏 李志向 唐宇涛 许帆 吴浩东 张涵 唐江山 阮亚平 夏可宇 Tiantian Zhang;Wenpeng Zhou;Zhixiang Li;Yutao Tang;Fan Xu;Haodong Wu;Han Zhang;Jiang-Shan Tang;Ya-Ping Ruan;Keyu Xia(College of Engineering and Applied Sciences,National Laboratory of Solid State Microstructures,and Collaborative Innovation Center of Advanced Microstructures,Nanjing University,Nanjing 210093,China;Shenzhen Shaanxi Coal Hi-tech Research Institute Co.,Ltd,Shenzhen 518083,China;School of Physics,Nanjing University,Nanjing 210023,China;Jiangsu Key Laboratory of Artificial Functional Materials,Nanjing University,Nanjing 210023,China)

机构地区：[1]College of Engineering and Applied Sciences,National Laboratory of Solid State Microstructures,and Collaborative Innovation Center of Advanced Microstructures,Nanjing University,Nanjing 210093,China [2]Shenzhen Shaanxi Coal Hi-tech Research Institute Co.,Ltd,Shenzhen 518083,China [3]School of Physics,Nanjing University,Nanjing 210023,China [4]Jiangsu Key Laboratory of Artificial Functional Materials,Nanjing University,Nanjing 210023,China

出　　处：《Chinese Physics Letters》2024年第4期59-68,共10页中国物理快报（英文版）

基　　金：supported by the National Key R&D Program of China(Grant No.2019YFA0308700);the National Natural Science Foundation of China(Grant Nos.11890704,92365107,and 12305020);the Program for Innovative Talents and Teams in Jiangsu(Grant No.JSSCTD202138);the Shccig-Qinling Program,the China Postdoctoral Science Foundation(Grant No.2023M731613);the Jiangsu Funding Program for Excellent Postdoctoral Talent(Grant No.2023ZB708)。

摘　　要：Nonreciprocal optical devices are essential for laser protection,modern optical communication and quantum information processing by enforcing one-way light propagation.The conventional Faraday magneto-optical nonreciprocal devices rely on a strong magnetic field,which is provided by a permanent magnet.As a result,the isolation direction of such devices is fixed and severely restricts their applications in quantum networks.In this work,we experimentally demonstrate the simultaneous one-way transmission and unidirectional reflection by using a magneto-optical Fabry-Pérot cavity and a magnetic field strength of 50 mT.An optical isolator and a three-port quasi-circulator are realized based on this nonreciprocal cavity system.The isolator achieves an isolation ratio of up to 22 dB and an averaged insertion loss down to 0.97 dB.The quasi-circulator is realized with a fidelity exceeding 99% and an overall survival probability of 89.9%,corresponding to an insertion loss of~0.46 dB.The magnetic field is provided by an electromagnetic coil,thereby allowing for reversing the light circulating path.The reversible quasi-circulator paves the way for building reconfigurable quantum networks.

关 键 词：quantum reciprocal INSERTION 

分 类 号：TN256[电子电信—物理电子学]