Author(s): Zhang, GW (Zhang, Guo-Wei); Chen, W (Chen, Wei); Fan-Yuan, GJ (Fan-Yuan, Guan-Jie); Zhang, L (Zhang, Li); Wang, FX (Wang, Fang-Xiang); Wang, S (Wang, Shuang); Yin, ZQ (Yin, Zhen-Qiang); He, DY (He, De-Yong); Liu, W (Liu, Wen); An, JM (An, Jun-Ming); Guo, GC (Guo, Guang-Can); Han, ZF (Han, Zheng-Fu)

Source: SCIENCE CHINA-INFORMATION SCIENCES Volume: 65 Issue: 10 Special Issue: SI Article Number: 200506 DOI: 10.1007/s11432-022-3514-3 Published: OCT 2022

Abstract: 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.

Accession Number: WOS:000849196200001

ISSN: 1674-733X

eISSN: 1869-1919

Full Text: https://link.springer.com/article/10.1007/s11432-022-3514-3