Polarization-insensitive quantum key distribution using planar lightwave circuit chips  

作　　者：Guo-Wei ZHANG Wei CHEN Guan-Jie FAN-YUAN Li ZHANG Fang-Xiang WANG Shuang WANG Zhen-Qiang YIN De-Yong HE Wen LIU Jun-Ming AN Guang-Can GUO Zheng-Fu HAN 

机构地区：[1]CAS Key Laboratory of Quantum Information,University of Science and Technology of China,Hefei 230026,China [2]CAS Center for Excellence in Quantum Information and Quantum Physics,University of Science and Technology of China,Hefei 230026,China [3]Hefei Quantachip Technology Co.,Ltd.,Hefei 230026,China [4]USTC Center for Micro-and Nanoscale Research and Fabrication,University of Science and Technology of China,Hefei 230026,China [5]State Key Laboratory on Integrated Optoelectronics,Institute of Semiconductors,Chinese Academy of Sciences,Beijing 100083,China [6]Center of Materials Science and Optoelectronics Engineering,University of Chinese Academy of Sciences,Beijing 100049,China

出　　处：《Science China(Information Sciences)》2022年第10期62-68,共7页中国科学（信息科学）（英文版）

基　　金：supported by National Key Research and Development Program of China(Grant No.2018YFA0306400);National Natural Science Foundation of China(Grant Nos.61627820,61622506,61822115);Anhui Initiative in Quantum Information Technologies(Grant No.AHY030000)。

摘　　要：Self-stabilizing the quantum key distribution(QKD)system is essential to evaluate eavesdroppers’information accurately.We develop and verify a polarization-insensitive time-bin decoder chip for QKD with the hybrid asymmetric Faraday-Michelson interferometer(AFMI)based on the planar lightwave circuit(PLC).Compared with existing chip-based QKD works,the scheme can intrinsically compensate for the polarization perturbation to quantum signals and thus work at arbitrary temperatures.We experimentally verify the chips in a time-bin QKD system at the clocking rate of 1.25 GHz and obtain an average secure key rate(SKR)of 1.34 Mbps over a 50 km fiber channel with an optimized analysis model.The steady variations of the quantum bit error and SKR with random polarization disturbance demonstrate that PLC-based AFMIs are available for developing self-stable QKD systems.

关 键 词：polarization insensitive time-bin asymmetric Faraday-Michelson interferometer quantum key distribution planar lightwave circuit 

分 类 号：O413[理学—理论物理] TN918.4[理学—物理]