量子电子学报 ›› 2026, Vol. 43 ›› Issue (3): 431-442.doi: 10.3969/j.issn.1007-5461.2026.03.010

• 量子光学 • 上一篇    下一篇

基于被动光源监测的相位匹配量子密钥分发

吕 磅 1, 汪溢镭 1, 朱雪阳 2, 王译锋 1, 冯 宝 2*   

  1. 1 国网浙江省电力有限公司电力科学研究院, 浙江 杭州 310014;2 南京南瑞信息通信科技有限公司, 江苏 南京 210000
  • 收稿日期:2024-05-10 修回日期:2024-07-18 出版日期:2026-05-28 发布日期:2026-05-28
  • 通讯作者: E-mail: nrgd_lw@163.com E-mail: E-mail: nrgd_lw@163.com
  • 作者简介: 吕 磅 ( 1991 - ), 浙江金华人, 硕士, 工程师, 主要从事信息通信技术、网络安全、物联安全等方面的研究。 E-mail: lv_bang@zj.sgcc.com.cn
  • 基金资助:
    国网浙江省电力有限公司科技项目(B311DS23000M)

Phase‑matching quantum key distribution protocol based on passive light source monitoring

LÜ Bang 1 , WANG Yilei 1 , ZHU Xueyang 2 , WANG Yifeng 1 , FENG Bao 2*   

  1. 1 Electric Power Research Institute, State Grid Zhejiang Electric Power Co., Ltd., Hangzhou 310014, China;2 Nangjing NARI Information & Communication Technology Co., Ltd., Nanjing 210000, China
  • Received:2024-05-10 Revised:2024-07-18 Published:2026-05-28 Online:2026-05-28

摘要: 本文提出了一种基于被动光源监测(PLSM)的相位匹配量子密钥分发(PLSM-PM-QKD)协议。该协议利用PLSM模块中本地探测器的响应情况对光源的概率分布进行估计, 避免了主动光源监测(ALSM)方案所引入的安全性问题。仿真结果表明, 在考虑非理想光源并引入调制误差的情况下, PLSM-PM-QKD协议的性能显著优于ALSM-PM-QKD协议; 在其他情况下, PLSM-PM-QKD协议的密钥率与最大传输距离均与ALSM-PM-QKD协议几乎一致, 且二者均与PM-QKD协议极为接近。此外, 还分析了所提协议的非对称信道及有限长效应对密钥率性能的影响。

关键词: 量子光学, 相位匹配量子密钥分发协议, 非理想光源, 被动光源监测

Abstract: A phase-matching quantum key distribution (PM-QKD) protocol based on passive light source monitoring (PLSM) is proposed in this work. In this protocol, the response results of local detectors in the PLSM module are used to estimate the probability distribution of the light source, thereby avoiding the security issues introduced by the active light source monitoring (ALSM) scheme. Simulation results show that, when non-ideal light sources and modulation errors are taken into account, the performance of the proposed PLSM-PM-QKD protocol is significantly better than that of the ALSM-PM-QKD protocol. In other scenarios, the key rate and maximum transmission distance of the PLSM-PM-QKD protocol are nearly identical to those of the ALSM-PM-QKD protocol, and both of them are extremely close to those of the standard PM-QKD protocol. Additionally, the impact of the asymmetric channels and finite-length effects of the proposed protocal on the key rate performance is also analyzed.

Key words: quantum optics, phase-matching quantum key distribution protocol, non-ideal light source, passive light source monitoring

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