量子多址高斯信道的信息容量研究  

Capacity of quantum multiple access Gaussian channel

作　　者：赵生妹[1] 刘静[1] 

机构地区：[1]南京邮电大学信号处理与传输研究院,南京210003

出　　处：《物理学报》2010年第2期771-777,共7页Acta Physica Sinica

基　　金：国家自然科学基金(批准号:60672133);江苏省留学基金;江苏省"青蓝工程"(批准号:TJ207006);教育部博士点专项科研基金(批准号:20060293003)资助的课题~~

摘　　要：与经典通信相类似,量子高斯噪声是一种重要的量子噪声模型.这里,"经典"是相对于"量子"而言的.讨论量子高斯信道传送经典信息时的信息容量,也称量子信道的经典容量,是量子通信的热点问题之一.文中在量子高斯态、高斯熵性质和Holevo界基础上,给出单用户量子高斯信道的经典容量,借助多址量子信道的经典容量区域定理,通过坐标系变换方法,从理论上推导得到多用户量子高斯信道的经典容量区域.为了计算简便且不失一般性,计算过程将采用两输入、单输出的量子多址信道模型进行说明,结论可类推到n个输入、单输出的多址信道.As its classical counterpart,quantum Gaussian noise is an important noise model in quantum information theory. The study of capacity of quantum Gaussian channel plays an important role in quantum communications. Based on the definition of quantum Gaussian state,the entropy of quantum Gaussian state,and Holevo bound theorem,the classical capacity of quantum Gaussian channel is given at first in the paper,where the classical capacity is defined as the capacity when only classical messages are transmitted through the quantum channel. Then,the classical capacities of quantum multiple access Gaussian channels are deduced according to the classical capacity theorem of multiple access quantum channels. For simplicity and generality,a multiple access quantum channel with two senders and one receiver is used for computation. The results can be generalized to the quantum channel with n senders and one receiver.

关 键 词：量子高斯信道 量子多址信道 信道容量区域 可达速率对 

分 类 号：O413[理学—理论物理] TN914.42[理学—物理]