Geometric measure of quantum discord and the geometry of a class of two-qubit states

被引：0

作者：

SONG Wei ^{[1
]}

YU LongBao ^{[1
]}

DONG Ping ^{[1
]}

LI DaChuang ^{[1
,2
]}

YANG Ming ^{[3
]}

CAO ZhuoLiang ^{[1
]}

机构：

[1] School of Electronic and Information Engineering, Hefei Normal University

[2] Hefei National Laboratory for Physical Sciences at the Microscale and Department of Modern Physics, University of Science and Technology of China

[3] School of Physics and Material Science, Anhui University

来源：

Science China(Physics,Mechanics & Astronomy) | 2013年 / 04期

关键词：

geometric measure of quantum discord; geometric picture; two-qubit states;

D O I：

暂无

中图分类号：

O431.2 [量子光学];

学科分类号：

070207 ; 0803 ;

摘要：

We investigate the geometric picture of the level surfaces of quantum entanglement and geometric measure of quantum discord(GMQD) of a class of X-states, respectively. This pictorial approach provides us a direct understanding of the structure of entanglement and GMQD. The dynamic evolution of GMQD under two typical kinds of quantum decoherence channels is also investigated. It is shown that there exists a class of initial states for which the GMQD is not destroyed by decoherence in a finite time interval. Furthermore, we establish a factorization law between the initial and final GMQD, which allows us to infer the evolution of entanglement under the influences of the environment.

引用

页码：737 / 744

页数：8