Quantum correlation of a three-particle W-class state under quantum decoherence

doi:10.1088/1674-1056/22/10/100306

Abstract We investigate the quantum characteristics of a three-particle W-class state and reveal the relationship between quantum discord and quantum entanglement under decoherence. We can also identify the state for which discord takes a maximal value for a given decoherence factor, and present a strong bound on quantum entanglement–quantum discord. In contrast, a striking result will be obtained that the quantum discord is not always stronger than the entanglement of formation in the case of decoherence. Furthermore, we also theoretically study the variation trend of the monogamy of quantum correlations for the three-particle W-class state under the phase flip channel, and find that the three-particle W-class state could transform from polygamous into monogamous, owing to the decoherence.

Keywords: quantum correlations quantum entanglement quantum discord W-class state

Received: 24 January 2013
Revised: 02 April 2013
Accepted manuscript online:

PACS:	03.65.Ud	(Entanglement and quantum nonlocality)
	03.67.-a	(Quantum information)
	03.67.Mn	(Entanglement measures, witnesses, and other characterizations)

Fund: Project supported by the National Natural Science Foundation of China (Grant Nos. 11074002, 61275119, and 11247256), the Doctoral Science Foundation of the Ministry of Education of China (Grant No. 20103401110003), the Fund of the Education Department of Anhui Province for Outstanding Youth, China (Grant No. 2012SQRL023), the Doctor Scientific Research Fund of Anhui University, China (Grant No. 33190058), and the Personal Development Foundation of Anhui Province, China (Grant No. 2008Z018).

Corresponding Authors: Ye Liu
E-mail: yeliu@ahu.edu.cn

Cite this article:

Xu Peng (许鹏), Wang Dong (王栋), Ye Liu (叶柳) Quantum correlation of a three-particle W-class state under quantum decoherence 2013 Chin. Phys. B 22 100306

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