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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 scheme based on binary uniform modulation coherent states is proposed.Compared with Gaussian signal sources in Gaussian modulated coherent state quantum key distribution scheme, binary source is the simplest source, binary modulation is the current digital optical fiber The most common modulation method in communication is technically easy to implement.The Shannon information theory is used to analyze the capability of this protocol to resist the beam separation attacks and to obtain the analytical expressions of secret information rate and modulation parameters, demodulation parameters and channel parameters.