A symmetric geometric measure and the dynamics of quantum discord  

作　　者：蒋峰建 吕海江 闫新虎 石名俊 

机构地区：[1]Department of Modern Physics, University of Science and Technology of China [2]School of Information Engineering, Huangshan University

出　　处：《Chinese Physics B》2013年第4期94-102,共9页中国物理B（英文版）

基　　金：Project supported by the National Fundamental Research Program of China (Grant No. 2007CB925200);the National Natural Science Foundation of China(Grant No. 11275083);the Natural Science Foundation of Anhui Province of China (Grant No. KJ2012B180)

摘　　要：A symmetric measure of quantum correlation based on the Hilbert–Schmidt distance is presented in this paper. For two-qubit states, we considerably simplify the optimization procedure so that numerical evaluation can be performed efficiently. Analytical expressions for the quantum correlation are attained for some special states. We further investigate the dynamics of quantum correlation of the system qubits in the presence of independent dissipative environments. Several nontrivial aspects are demonstrated. We find that the quantum correlation can increase even if the system state is suffering from dissipative noise. Sudden changes occur, even twice, in the time evolution of quantum correlation. There exists a certain correspondence between the evolution of quantum correlation in the systems and that in the environments, and the quantum correlation in the systems will be transferred into the environments completely and asymptotically.A symmetric measure of quantum correlation based on the Hilbert–Schmidt distance is presented in this paper. For two-qubit states, we considerably simplify the optimization procedure so that numerical evaluation can be performed efficiently. Analytical expressions for the quantum correlation are attained for some special states. We further investigate the dynamics of quantum correlation of the system qubits in the presence of independent dissipative environments. Several nontrivial aspects are demonstrated. We find that the quantum correlation can increase even if the system state is suffering from dissipative noise. Sudden changes occur, even twice, in the time evolution of quantum correlation. There exists a certain correspondence between the evolution of quantum correlation in the systems and that in the environments, and the quantum correlation in the systems will be transferred into the environments completely and asymptotically.

关 键 词：quantum correlation geometric measure 

分 类 号：O413[理学—理论物理]