Discord and entanglement in non-Markovian environments at finite temperatures

doi:10.1088/1674-1056/25/9/090302

中国物理B ›› 2016, Vol. 25 ›› Issue (9): 90302-090302.doi: 10.1088/1674-1056/25/9/090302

Discord and entanglement in non-Markovian environments at finite temperatures

Hong-Mei Zou(邹红梅), Mao-Fa Fang(方卯发)

Key Laboratory of Low-dimensional Quantum Structures and Quantum Control of Ministry of Education, College of Physics and Information Science, Hunan Normal University, Changsha 410081, China

收稿日期:2015-07-30 修回日期:2015-10-20 出版日期:2016-09-05 发布日期:2016-09-05
通讯作者: Hong-Mei Zou E-mail:zhmzc1997@126.com
基金资助:
Project supported by the Science and Technology Plan of Hunan Province, China (Grant No. 2010FJ3148), the National Natural Science Foundation of China (Grant No. 11374096), and the Doctoral Science Foundation of Hunan Normal University, China.

Discord and entanglement in non-Markovian environments at finite temperatures

Hong-Mei Zou(邹红梅), Mao-Fa Fang(方卯发)

Key Laboratory of Low-dimensional Quantum Structures and Quantum Control of Ministry of Education, College of Physics and Information Science, Hunan Normal University, Changsha 410081, China

Received:2015-07-30 Revised:2015-10-20 Online:2016-09-05 Published:2016-09-05
Contact: Hong-Mei Zou E-mail:zhmzc1997@126.com
Supported by:
Project supported by the Science and Technology Plan of Hunan Province, China (Grant No. 2010FJ3148), the National Natural Science Foundation of China (Grant No. 11374096), and the Doctoral Science Foundation of Hunan Normal University, China.

摘要/Abstract

摘要： The dynamic evolutions of the discord and entanglement of two atoms immersed in two independent Lorentzian reservoirs at zero and finite temperatures have been investigated by using the time-convolutionless master-equation method. Our results show that, nonzero temperature can induce the entanglement sudden death and accelerate the decays of discord and entanglement. The discord and the entanglement have different robustness for different initial states and their robustness may change under certain conditions. When both the non-Markovian effect and detuning are present simultaneously, due to the memory and feedback effect of non-Markovian reservoirs, the discord and entanglement can be effectively protected even at nonzero temperature by increasing the non-Markovian effect and the detuning.

关键词: discord, entanglement, non-Markovian environment, temperature

Abstract: The dynamic evolutions of the discord and entanglement of two atoms immersed in two independent Lorentzian reservoirs at zero and finite temperatures have been investigated by using the time-convolutionless master-equation method. Our results show that, nonzero temperature can induce the entanglement sudden death and accelerate the decays of discord and entanglement. The discord and the entanglement have different robustness for different initial states and their robustness may change under certain conditions. When both the non-Markovian effect and detuning are present simultaneously, due to the memory and feedback effect of non-Markovian reservoirs, the discord and entanglement can be effectively protected even at nonzero temperature by increasing the non-Markovian effect and the detuning.

Key words: discord, entanglement, non-Markovian environment, temperature

中图分类号: (Decoherence; open systems; quantum statistical methods)

03.65.Yz

03.67.-a (Quantum information) 42.50.Pq (Cavity quantum electrodynamics; micromasers)

邹红梅, 方卯发. Discord and entanglement in non-Markovian environments at finite temperatures[J]. 中国物理B, 2016, 25(9): 90302-090302.

Hong-Mei Zou(邹红梅), Mao-Fa Fang(方卯发). Discord and entanglement in non-Markovian environments at finite temperatures[J]. Chin. Phys. B, 2016, 25(9): 90302-090302.

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Discord and entanglement in non-Markovian environments at finite temperatures

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