Robustness of quantum discord to sudden death in nuclear magnetic resonance

doi:10.1088/1674-1056/21/4/040302

Abstract We investigate the dynamics of the entanglement and quantum discord of two qubits in liquid state homonuclear nuclear magnetic resonance. Applying a phenomenological description for nuclear magnetic resonance under a relaxation process, and taking a group of typical parameters of nuclear magnetic resonance, we show that when a zero initial state experiences a relaxation process, its entanglement disappears completely after a sequence of so-called sudden deaths and revivals, while the quantum discord retains remarkable values after a sequence of oscillations. That is to say, the quantum discord is more robust than entanglement.

Keywords: quantum discord nuclear magnetic resonance concurrence sudden death

Received: 31 July 2011
Revised: 28 September 2011
Accepted manuscript online:

PACS:	03.65.Ud	(Entanglement and quantum nonlocality)
	03.65.Yz	(Decoherence; open systems; quantum statistical methods)
	76.60.Es	(Relaxation effects)

Fund: Project supported by the Fundamental Research Funds for the Central Universities of China(Grant No.2010scu23002)

Corresponding Authors: Xu Jian-Wei, E-mail:xxujianwei@yahoo.cn
E-mail: xxujianwei@yahoo.cn

Cite this article:

Xu Jian-Wei(胥建卫) and Chen Qi-Hui(陈起辉) Robustness of quantum discord to sudden death in nuclear magnetic resonance 2012 Chin. Phys. B 21 040302

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