The spatial degrees of freedom of MIMO quantum channels
The spatial degrees of freedom of MIMO quantum channels
复制标题
DOI：
10.7498/aps.58.3685
复制
发表时间：
2009-06
影响因子：
1
通讯作者：
Hai-lin Xiao;Ouyang Shan;Zaiping Nie
中科院分区：
文献类型：
--
作者：
Hai-lin Xiao;Ouyang Shan;Zaiping Nie
量子通信是一个量子密钥分发过程。当前的QKD技术将通信限制在低比特率。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.量子噪声是由量子力学决定的.文中采用光子场的量子化和满足Schrdinger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 Schrdinger 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.