MIMO量子信道的空间自由度研究  

The spatial degrees of freedom of MIMO quantum channels

作　　者：肖海林[1,2] 欧阳缮[2] 聂在平[1] 

机构地区：[1]电子科技大学电子工程学院,成都610054 [2]桂林电子科技大学信息与通信学院,桂林541004

出　　处：《物理学报》2009年第6期3685-3691,共7页Acta Physica Sinica

基　　金：国家重点基础研究发展计划(批准号:2008CB317109);国家高技术研究发展计划(批准号:2002AA123032);国家自然科学基金(批准号:60572054)资助的课题~~

摘　　要：量子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)技术应用于量子通信系统,提高量子密钥分发的比特率,促进量子通信向高速大容量发展.然而,量子场本身不可避免地存在量子噪声约束容量的增长,限制了可利用空间资源,即空间自由度.文中采用光子场的量子化和满足Schrdinger方程条件的电磁场波动方程推导出MIMO量子信道的空间自由度上限,为开发稳健的MIMO量子通信空时处理算法和优化设计高性能MIMO量子通信系统提供理论基础和技术支持.Quantum communication is a process of quantum key distribution （QKD）. Current QKD technology restricts communication to a low bit rate. To improve the QKD bit rate and develop high rate and capacity, we propose a multiple-input-multiple-output quantum key distribution system. However, quantum field itself inevitably involves quantum noise （which is determined by the quantum mechanics ）, which restrains the increase of capacity, and limits space resource utilization, that is, the problem of spatial degrees of freedom arises. The quantumization of the photon field and the electromagnetic wave equation satisfying the Schrodinger equation condition are adopted to investigate the upper bound of the spatial degrees of freedom for MIMO quantum channels, which will provide theoretical support and technical basis for developing robust space time processing algorithm for MIMO quantum communication and designing high performance systems.

关 键 词：多输入多输出 量子密钥分发 Schrdinger方程 光子场的量子化 

分 类 号：TN918[电子电信—通信与信息系统] O431.2[电子电信—信息与通信工程]