One-Way Information Deficit and Geometry for a Class of Two-Qubit States

作     者：王耀坤 马腾 李波 王志玺 

作者机构：School of Mathematical SciencesCapital Normal University College of MathematicsTonghua Normal University Institute of PhysicsChinese Academy of Sciences Department of Mathematics and ComputerShangrao Normal University 

出 版 物：《Communications in Theoretical Physics》 (理论物理通讯（英文版）)

年 卷 期：2013年第59卷第5期

页      面：540-546页

核心收录：

学科分类：07[理学] 070201[理学-理论物理] 0704[理学-天文学] 0702[理学-物理学] 

基　　金：Supported by National Natural Science Foundation of China under Grant No.11101017 Beijing Natural Science Foundation Program and Scientific Research Key Program of Beijing Municipal Commission of Education under Grant No.KZ201210028032 Funding Project for Beijing Municipality under Grant No.201007107 

主　　题：quantum discord one-way information deficit Bell-diagonal entropy 

摘      要：The work deficit, as introduced by Jonathan Oppenheim et al. [Phys. Rev. Left. 89 （2002） 180402] is a good measure of the quantum correlations in a state and provides a new standpoint for understanding quantum non-locality. In this paper, we analytically evaluate the one-way information deficit （OWID） for the Bell-diagonai states and a class of two-qubit states and further give the geometry picture for OWID. The dynamic behavior of the OWID under decoherence channel is investigated and it is shown that the OWID of some classes of X states is more robust against the decoherence than the entanglement.