Sudden death of entanglement of two atoms interacting with thermal fields

doi:10.1088/1674-1056/20/8/080303

中国物理B ›› 2011, Vol. 20 ›› Issue (8): 80303-080303.doi: 10.1088/1674-1056/20/8/080303

Sudden death of entanglement of two atoms interacting with thermal fields

罗成立, 缪龙, 郑小兰, 陈子翃, 廖长庚

Department of Physics, Fuzhou University, Fuzhou 350002, China

收稿日期:2010-09-09 修回日期:2011-03-02 出版日期:2011-08-15 发布日期:2011-08-15
基金资助:
Project supported by the National Natural Science Foundation of China (Grant No. 10974028), the Natural Science Foundation of Fujian Province of China (Grant No. 2009J06002), and the Funds from the State Key Laboratory Breeding Base of Photocatalysis.

Sudden death of entanglement of two atoms interacting with thermal fields

Luo Cheng-Li(罗成立)^†, Miao Long(缪龙), Zheng Xiao-Lan(郑小兰), Chen Zi-Hong(陈子翃), and Liao Chang-Geng(廖长庚)

Department of Physics, Fuzhou University, Fuzhou 350002, China

Received:2010-09-09 Revised:2011-03-02 Online:2011-08-15 Published:2011-08-15
Supported by:
Project supported by the National Natural Science Foundation of China (Grant No. 10974028), the Natural Science Foundation of Fujian Province of China (Grant No. 2009J06002), and the Funds from the State Key Laboratory Breeding Base of Photocatalysis.

摘要/Abstract

摘要： We investigate the entanglement dynamics of two initially entangled atoms each interacting with a thermal field. We show that the two entangled atoms become completely disentangled in a finite time and that the lost information cannot return to the atomic system when the mean photon number of the thermal field exceeds a critical value (3.3584), even though the whole system is lossless. Then we study how the detuning between the atomic transition frequency and the field frequency and the disparity between two coupling rates would affect the evolution of the entanglement of the atomic system.

Abstract: We investigate the entanglement dynamics of two initially entangled atoms each interacting with a thermal field. We show that the two entangled atoms become completely disentangled in a finite time and that the lost information cannot return to the atomic system when the mean photon number of the thermal field exceeds a critical value (3.3584), even though the whole system is lossless. Then we study how the detuning between the atomic transition frequency and the field frequency and the disparity between two coupling rates would affect the evolution of the entanglement of the atomic system.

Key words: entanglement sudden death, thermal field, asymmetric, detuning

中图分类号: (Entanglement and quantum nonlocality)

03.65.Ud

42.50.Pq (Cavity quantum electrodynamics; micromasers) 42.50.Dv (Quantum state engineering and measurements)

罗成立, 缪龙, 郑小兰, 陈子翃, 廖长庚. Sudden death of entanglement of two atoms interacting with thermal fields[J]. 中国物理B, 2011, 20(8): 80303-080303.

Luo Cheng-Li(罗成立), Miao Long(缪龙), Zheng Xiao-Lan(郑小兰), Chen Zi-Hong(陈子翃), and Liao Chang-Geng(廖长庚). Sudden death of entanglement of two atoms interacting with thermal fields[J]. Chin. Phys. B, 2011, 20(8): 80303-080303.

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Sudden death of entanglement of two atoms interacting with thermal fields

Sudden death of entanglement of two atoms interacting with thermal fields

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