Table of Contents
Journal of Atomic and Molecular Physics
Volume 2014 (2014), Article ID 564805, 6 pages
http://dx.doi.org/10.1155/2014/564805
Research Article

Correlated Relation between Quantum Discord and Entanglement of Two-Atom in Thermal Reservoirs

Department of Physics, School of Science, Tianjin Polytechnic University, Tianjin 300387, China

Received 6 December 2013; Revised 18 March 2014; Accepted 19 March 2014; Published 10 April 2014

Academic Editor: Keli Han

Copyright © 2014 Xue-Qun Yan and Zhuan-Lin Yue. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

We study the time evolution of quantum discord and entanglement of a two-qubit system in thermal reservoirs. We find that there are no simple ordering relations between entanglement and quantum discord for the dynamical evolution behavior; that is, quantum discord may be smaller or larger than entanglement in the evolution process. However, a strong correlation between changes of the ordering relations and the mean photon number is found. In addition, it also shows that entanglement is not the strongest form of nonclassicality.