无直接耦合自旋之间的量子信息传递  

Information Transmission between Non Direct-coupled Spins in NMR Quantu m Computer

作　　者：魏达秀[1] 杨晓冬[1] 罗军[1] 孙献平[1] 曾锡之[1] 刘买利[1] 丁尚武[1] 

机构地区：[1]中国科学院武汉物理与数学研究所波谱与原子分子物理国家重点实验室,湖北武汉430071

出　　处：《原子核物理评论》2002年第z1期159-161,共3页Nuclear Physics Review

基　　金：国家自然科学基金资助项目(19874 0 73)~~

摘　　要：核磁共振量子计算机在实现多量子位之间的信息传递时 ,随着量子位的增多 ,物理距离相距较远的量子位之间的耦合作用会很弱 ,从而很难在没有耦合的量子位之间直接实现信息的传递 .然而根据量子超密编码原理和自旋交换操作 ,可以在两个没有直接相互作用的自旋之间实现两位经典信息的传递 .根据量子超密编码和自旋交换操作的原理 ,分析了无直接耦合自旋之间的量子信息传递的方法和过程 。In nuclear magnetic resonance (NMR) system, the interaction s between two arbitrary non direct-coupled spins always become very small along w ith the increasing of their distance. So it is very difficult to realize the inf ormation transmission between two non direct-coupled spins. Fortunately, by int roducing the quantum super dense coding (QSDC) and the spin swap operation, this difficulty can be overcome. In this paper, we analyze the scheme of transmitting information between two non direct-coupled spins. We also demonstrate the scheme on NMR simulation qua ntum computer and Bruker ARX-500 NMR quantum computer.

关 键 词：量子超密编码 自旋交换算符 信息传递 核磁共振 

分 类 号：O456[理学—无线电物理]