摘要
量子密钥分发(QKD)在信道中容易丢失信息载体,因此有限的通信距离和密钥生成速率是其应用的主要瓶颈。一般而言,密钥速率受信道传输速率的限制,而相位匹配量子密钥分发(PM-QKD)协议的提出克服了线性密钥速率的约束,即安全密钥速率与传输速率的平方根成正比。虽然PM-QKD协议可以保证探测器的安全性,但光源方面仍存在一些缺陷。在PM-QKD协议中,一般假设光源为理想相干态,而这与实际的QKD系统不完全相符,从而造成一些安全问题。本研究讨论了光子数分布未知条件下的PM-QKD协议,证明了光子数分布未知条件下的安全性分析仍然是合理的,也表明基于光源检测的PM-QKD协议产生的密钥率与理想光源下的密钥率基本一致。
Quantum key distribution(QKD)is easy to lose information carriers in channels,so the limited communication distance and key generation rate are the main bottlenecks of its application.Generally,the key rate is limited by the channel transmission rate.The proposed phase-matching quantum key distribution(PM-QKD)protocol overcomes the linear key rate constraint that the secure key rate is proportional to the square root of the transmission rate.Although the PM-QKD protocol can guarantee the security of the detector,there are still some defects in the light source.In the PM-QKD protocol,it is generally assumed that the light source is an ideal coherent state,which is not consistent with the actual QKD system,resulting in some security problems.In this paper,the PM-QKD protocol is discussed under the condition of unknown photon number distribution(UPD),and it's confirmed that the security analysis is still reasonable under the condition of unknown photon number distribution,and it's also shown that the key rate generated by PM-QKD protocol based on light source detection is basically consistent with the key rate under ideal light source.
作者
胡倩倩
冯宝
闫龙川
赵晓红
陈智雨
李文婷
李威
HU Qianqian;FENG Bao;YAN Longchuan;ZHAO Xiaohong;CHEN Zhiyu;LI Wenting;LI Wei(NARI Group Co.,Ltd.(State Grid Electric Power Research Institute Co.,Ltd.),Nanjing 210000,China;NRGD Quantum Technology Co.,Ltd.,Nanjing 210000,China;State Grid Information Communication Technology Co.,Ltd,Beijing 100000,China;Electric Power Research Institute of State Grid Fujian Electric Power Co.,Ltd.,Jinan 250000,China;Nanjing University of Posts and Telecommunications,Nanjing 210003,China)
出处
《量子电子学报》
CAS
CSCD
北大核心
2023年第5期712-718,共7页
Chinese Journal of Quantum Electronics
基金
国家电网公司科技项目(SGSDDK00WJJS1900368)。
关键词
量子信息
量子密钥分发
相位匹配
光源监测
光源涨落
光子数分布
quantum information
quantum key distribution
phase-matching
light source monitoring
source fluctuation
photon number distribution
