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 

作者机构：CAS Key Laboratory of Quantum Information University of Science and Technology of China CAS Center for Excellence in Quantum Information and Quantum Physics University of Science and Technology of China Hefei Quantachip Technology Co.Ltd. USTC Center for Micro-and Nanoscale Research and Fabrication University of Science and Technology of China State Key Laboratory on Integrated Optoelectronics Institute of Semiconductors Chinese Academy of Sciences Center of Materials Science and Optoelectronics Engineering University of Chinese Academy of Sciences 

出 版 物：《Science China(Information Sciences)》 (中国科学:信息科学(英文版))

年 卷 期：2022年第65卷第10期

页      面：66-72页

核心收录：

学科分类：11[军事学] 1105[军事学-军队指挥学] 07[理学] 0839[工学-网络空间安全] 08[工学] 070201[理学-理论物理] 110505[军事学-密码学] 110503[军事学-军事通信学] 0702[理学-物理学] 

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) 

主　　题：polarization insensitive time-bin asymmetric Faraday-Michelson interferometer quantum key distribution planar lightwave circuit 

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.