Sudden death of entanglement of two atoms interacting with thermal fields

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 th...

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Bibliographic Details
Published inChinese physics B Vol. 20; no. 8; pp. 30 - 38
Main Authors Luo, Cheng-Li, Miao, Long, Zheng, Xiao-Lan, Chen, Zi-Hong, Liao, Chang-Geng
Format Journal Article
LanguageEnglish
Published 01.08.2011
Subjects
动力学
原子系统
平均光子数
热场
猝死
相互作用
纠缠原子
跃迁频率
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Summary: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.
Bibliography:entanglement sudden death, thermal field, asymmetric, detuning
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.
11-5639/O4
ISSN:1674-1056
2058-3834
DOI:10.1088/1674-1056/20/8/080303