中国物理B ›› 2013, Vol. 22 ›› Issue (4): 40303-040303.doi: 10.1088/1674-1056/22/4/040303

• GENERAL • 上一篇    下一篇

Symmetric geometric measure and dynamics of quantum discord

蒋峰建a b, 吕海江b, 闫新虎b, 石名俊a   

  1. a Department of Modern Physics, University of Science and Technology of China, Hefei 230026, China;
    b School of Information Engineering, Huangshan University, Huangshan 245041, China
  • 收稿日期:2012-12-21 修回日期:2013-01-25 出版日期:2013-03-01 发布日期:2013-03-01
  • 基金资助:
    Project supported by the National Fundamental Research Program of China (Grant Nos. 2007CB925200), the National Natural Science Foundation of China (Grant No. 11275083), and Natural Science Foundation of Anhui Province of China (Grant No. KJ2012B180).

Symmetric geometric measure and dynamics of quantum discord

Jiang Feng-Jian (蒋峰建)a b, Lü Hai-Jiang (吕海江)b, Yan Xin-Hu (闫新虎)b, Shi Ming-Jun (石名俊)a   

  1. a Department of Modern Physics, University of Science and Technology of China, Hefei 230026, China;
    b School of Information Engineering, Huangshan University, Huangshan 245041, China
  • Received:2012-12-21 Revised:2013-01-25 Online:2013-03-01 Published:2013-03-01
  • Contact: Jiang Feng-Jian, Shi Ming-Jun E-mail:jfjiang@mail.ustc.edu.cn; shmj@ustc.edu.cn
  • Supported by:
    Project supported by the National Fundamental Research Program of China (Grant Nos. 2007CB925200), the National Natural Science Foundation of China (Grant No. 11275083), and 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 simplify considerably 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

Abstract: A symmetric measure of quantum correlation based on the Hilbert-Schmidt distance is presented in this paper. For two-qubit states, we simplify considerably 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.

Key words: quantum correlation, geometric measure

中图分类号:  (Decoherence; open systems; quantum statistical methods)

  • 03.65.Yz
03.65.Ta (Foundations of quantum mechanics; measurement theory) 03.67.-a (Quantum information)