中文摘要：

量子安全通信是一个量子密钥分发过程,目前采用的通信技术严重制约了量子密钥分发的比特率.将多输入多输出（MIMO）技术应用于量子密钥分发系统,可提高量子密钥分发的比特率,促进量子安全通信向高速大容量发展.文中首先构造出MIMO量子密钥分发信道中多光子纠缠态Wigner算符矩阵.并在此基础上,推导出多光子双模压缩纠缠态Wigner算符矩阵和MIMO量子密钥分发信道容量.为开发稳健的MIMO量子安全通信空时处理算法和优化设计高性能MIMO量子密钥分发系统提供理论支撑和技术基础.

英文摘要：

Quantum safety communications is a process of quantum key distribution（QKD）.Current QKD technology restricts transmission to a low bit rate.To improve the QKD bit rate and develope high rate and large capacity,we propose a multiple-input-multiple-output（MIMO）quantum key distribution system.The Wigner operator of multi-photon entangled states in MIMO quantum key distribution channel is presented.As a result,the Wigner function of multi-photon double-model squeezed entangled sates and MIMO quantum key distribution channel capacity are also obtained, which will provide theoretical support and technical basis for developing robust space-time processing algorithm of MIMO quantum safety communications and designing optimum high performance system of MIMO quantum key distribution.