摘要
提出了一种基于二进制均匀调制相干态的量子密钥分发方案.相对于高斯调制相干态量子密钥分发方案中的高斯信源,二进制信源是最简单的信源,二进制调制是目前数字光纤通信中最普遍的调制方式,技术上容易实现.采用Shannon信息论分析了该协议抵抗光束分离攻击的能力,得到秘密信息速率与调制参数、解调参数以及信道参数之间的解析表达式.
A quantum key distribution （QKD） scheme using binary-modulated coherent states is proposed in this paper. Compared with Gaussian sources of QKD using Gaussian-modulated coherent states, the binary sources of the proposed scheme are the simplest sources, and the binary modulation is the most usual modulation format in the digital optical-fiber communication. The security of the proposed scheme against beam splitter attack is analyzed using Shannon information theory. The analytical expression of the secret information rate is given in terms of modulation-demodulation parameters and channel parameters. The quantum noise of coherent states guarantees the security of the proposed scheme.
出处
《物理学报》
SCIE
EI
CAS
CSCD
北大核心
2008年第4期2212-2217,共6页
Acta Physica Sinica
基金
上海交通大学青年教师科研启动基金(批准号:A2831B)
国家自然科学基金(批准号:60773085)
上海交通大学本科生研究计划(批准号:T03011030)资助的课题~~
关键词
量子密钥分发
二进制调制
光束分离攻击
quantum key distribution, binary modulation, beam splitter attack
