Controlling quantum discord dynamics in cavity QED systems by applying a classical driving field with phase decoherence

doi:10.1088/1674-1056/21/3/030305

中国物理B ›› 2012, Vol. 21 ›› Issue (3): 30305-030305.doi: 10.1088/1674-1056/21/3/030305

钱懿,许晶波

收稿日期:2011-09-24 修回日期:2011-11-05 出版日期:2012-02-15 发布日期:2012-02-15
通讯作者: 许晶波,xujb@zju.edu.cn E-mail:xujb@zju.edu.cn

Controlling quantum discord dynamics in cavity QED systems by applying a classical driving field with phase decoherence

Qian Yi(钱懿) and Xu Jing-Bo(许晶波)^†

Zhejiang Institute of Modern Physics and Physics Department, Zhejiang University, Hangzhou 310027, China

Received:2011-09-24 Revised:2011-11-05 Online:2012-02-15 Published:2012-02-15
Contact: Xu Jing-Bo,xujb@zju.edu.cn E-mail:xujb@zju.edu.cn
Supported by:
Project supported by National Natural Science Foundation of China (Grant No. 10774143).

摘要/Abstract

Abstract: We investigate a two-level atom interacting with a quantized cavity field and a classical driving field in the presence of phase decoherence and find that a stationary quantum discord can arise in the interaction of the atom and cavity field as the time turns to infinity. We also find that the stationary quantum discord can be increased by applying a classical driving field. Furthermore, we explore the quantum discord dynamics of two identical non-interacting two-level atoms independently interacting with a quantized cavity field and a classical driving field in the presence of phase decoherence. Results show that the quantum discord between two atoms is more robust than entanglement under phase decoherence and the classical driving field can help to improve the amount of quantum discord of the two atoms.

Key words: stationary quantum discord, classical driving field, phase decoherence

中图分类号: (Quantum information)

03.67.-a

钱懿,许晶波. [J]. 中国物理B, 2012, 21(3): 30305-030305.

Qian Yi(钱懿) and Xu Jing-Bo(许晶波) . Controlling quantum discord dynamics in cavity QED systems by applying a classical driving field with phase decoherence[J]. Chin. Phys. B, 2012, 21(3): 30305-030305.

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Controlling quantum discord dynamics in cavity QED systems by applying a classical driving field with phase decoherence

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