Robustness of quantum discord to sudden death in nuclear magnetic resonance

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

中国物理B ›› 2012, Vol. 21 ›› Issue (4): 40302-040302.doi: 10.1088/1674-1056/21/4/040302

胥建卫¹,陈起辉²

收稿日期:2011-07-31 修回日期:2011-09-28 出版日期:2012-02-29 发布日期:2012-02-29
通讯作者: 胥建卫, E-mail:xxujianwei@yahoo.cn E-mail:xxujianwei@yahoo.cn

Robustness of quantum discord to sudden death in nuclear magnetic resonance

Xu Jian-Wei(胥建卫)^a)^† and Chen Qi-Hui(陈起辉)^b)

a. Key Laboratory for Radiation Physics and Technology, Institute of Nuclear Science and Technology, Sichuan University, Chengdu 610065, China;
b. Physics Department, Sichuan University, Chengdu 610065, China

Received:2011-07-31 Revised:2011-09-28 Online:2012-02-29 Published:2012-02-29
Contact: Xu Jian-Wei, E-mail:xxujianwei@yahoo.cn E-mail:xxujianwei@yahoo.cn
Supported by:
Project supported by the Fundamental Research Funds for the Central Universities of China(Grant No.2010scu23002)

摘要/Abstract

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.

Key words: quantum discord, nuclear magnetic resonance, concurrence, sudden death

中图分类号: (Entanglement and quantum nonlocality)

03.65.Ud

03.65.Yz (Decoherence; open systems; quantum statistical methods) 76.60.Es (Relaxation effects)

胥建卫, 陈起辉. [J]. 中国物理B, 2012, 21(4): 40302-040302.

Xu Jian-Wei(胥建卫) and Chen Qi-Hui(陈起辉) . Robustness of quantum discord to sudden death in nuclear magnetic resonance[J]. Chin. Phys. B, 2012, 21(4): 40302-040302.

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Robustness of quantum discord to sudden death in nuclear magnetic resonance

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