Comparison and control of the robustness between quantum entanglement and quantum correlation in open quantum system

doi:10.1088/1674-1056/21/11/110304

Abstract We investigate the influence of environmental decoherence on the dynamics of coupled qubit system and quantum correlation. We analyse the relationship between concurrence and the degree of initial entanglement or the purity of initial quantum state, and also their relationship with quantum discord. The results show that the decrease of the purity of initial quantum state can induce the attenuation of concurrence or quantum discord, but the attenuation of quantum discord is obviously slower than concurrence's, correspondingly the survival time of quantum discord is longer. Further investigation reveals that the robustness of quantum discord and concurrence relies on the entanglement degree of initial quantum state. The higher the degree of entanglement, the more robust the quantum discord is than concurrence. And the reverse is equally true. The birth and death happen to quantum discord periodically and a newborn quantum discord comes into being under a certain condition, so does the concurrence.

Keywords: coupled qubits non-Markovian process entanglement quantum discord

Received: 29 March 2012
Revised: 30 April 2012
Accepted manuscript online:

PACS:	03.65.Ta	(Foundations of quantum mechanics; measurement theory)
	03.65.Ud	(Entanglement and quantum nonlocality)
	03.67.-a	(Quantum information)

Fund: Project supported by the National Natural Science Foundation of China (Grant No. 11164009).

Corresponding Authors: Ji Ying-Hua
E-mail: ahmxhxtt@yahoo.cn

Cite this article:

Ji Ying-Hua (嵇英华), Hu Ju-Ju (胡菊菊), Hu Yan (胡燕 ) Comparison and control of the robustness between quantum entanglement and quantum correlation in open quantum system 2012 Chin. Phys. B 21 110304

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Comparison and control of the robustness between quantum entanglement and quantum correlation in open quantum system

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