Real-Time Phase Tracking Scheme With Mismatched-Basis Data for Phase-Coding Quantum Key Distribution

IEEE Photonics Journal

Liangjiang Zhou¹  Dong Wang¹  Xiaotian Song¹  Yibo Zhao¹ 

[1] Institute of Electronics, National Key Laboratory of Microwave Imaging Technology, Chinese Academy of Sciences, Beijing, China;

关键词: Quantum key distribution;    phase tracking;   

DOI  :  10.1109/JPHOT.2020.2986343

来源: DOAJ

【 摘 要 】

Phase drift is an inevitable problem in the practical implementation of phase-coding quantum key distribution (QKD) systems. Conventional active phase tracking and compensation solutions cannot be implemented during the key transmission process, resulting in reduced efficiency of the system. In this paper, we propose a single-photon level real-time phase tracking scheme using only the estimated quantum bit error rate (QBER) and mismatched-basis data to acquire the phase drift parameter instead of a phase scanning process or reference light pulses, without extra hardware or interrupting the transmission of quantum signals. This scheme is applied into a phase-coding QKD system with active phase disturbance and obtains an average QBER of $1.01\%$ with a standard derivation of $0.37\%$ over 50 h of continuous operation. Experimental results show that this scheme enables QKD systems to operate continuously with long-term stability and keep a low level of QBER even with rapid phase drift, suggesting its suitability for practical applications.

【 授权许可】

Unknown