Relative entropy of entanglement of two-qubit 'X' states  

作　　者：黄接辉 刘念华 刘江涛 于天宝 何弦 

机构地区：[1]Department of Physics,Nanchang University

出　　处：《Chinese Physics B》2010年第11期84-89,共6页中国物理B（英文版）

基　　金：Project supported by the National Natural Science Foundation of China (Grant No. 10804042);supported by the Scientific Research Foundation of the Education Department of Jiangxi Province,China (Project No. GJJ09440)

摘　　要：Two closest single-qubit states could be diagonalised by the same unitary matrix, which helps to find the relative entropy of entanglement of a two-qubit ＇X＇ state. We formulate two binary equations for the relative entropy of entanglement and the corresponding closest separable state of a given two-qubit ＇X＇ state. This approach can be applied to get the relative entropy of entanglement of many widely-discussed two-qubit states, such as pure states, Werner states, and so on.Two closest single-qubit states could be diagonalised by the same unitary matrix, which helps to find the relative entropy of entanglement of a two-qubit ＇X＇ state. We formulate two binary equations for the relative entropy of entanglement and the corresponding closest separable state of a given two-qubit ＇X＇ state. This approach can be applied to get the relative entropy of entanglement of many widely-discussed two-qubit states, such as pure states, Werner states, and so on.

关 键 词：relative entropy of entanglement two-qubit state 

分 类 号：O413.1[理学—理论物理]