Partial entropy change and entanglement in the mixed state for a Jaynes-Cummings model with Kerr medium |
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引用本文: | 张玉青,谭磊,朱中华,熊祖周,刘利伟.Partial entropy change and entanglement in the mixed state for a Jaynes-Cummings model with Kerr medium[J].中国物理 B,2010,19(2):24210-024210. |
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作者姓名: | 张玉青 谭磊 朱中华 熊祖周 刘利伟 |
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作者单位: | Institute of Theoretical Physics, Lanzhou University, Lanzhou 730000, China |
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基金项目: | Project supported by the National
Natural Science Foundation of China (Grant No.~10704031), the
National Science Foundation for Fostering Talents in Basic Research
of the National Natural Science Foundation of China (Grant
No.~J0630313), the Fundamental Research Fund for Physics and
Mathematics of Lanzhou University (Grant No.~Lzu05001), and the
Natural Science Foundation of Gansu Province, China (Grant
No.~3ZS061-A25-035). |
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摘 要: | By using the algebraic dynamical approach, an atom--field
bipartite system in mixed state is employed to investigate the
partial entropy change and the entanglement in a cavity filled with
Kerr medium. The effects of different nonlinear intensities are
studied. One can find that the Kerr nonlinearity can reduce the
fluctuation amplitudes of the partial entropy changes and the
entanglement of the two subsystems, and also influence their
periodic evolution. Meanwhile, increasing the Kerr nonlinear
strength can convert the anti-correlated behaviour of the partial
entropy change to the positively correlated behaviour. Furthermore,
the entanglement greatly depends on the temperature. When the
temperature or the nonlinear intensity increases to a certain value,
the entanglement can be suppressed greatly.
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关 键 词: | entanglement algebraic dynamical method Jaynes-Cummings model Kerr medium |
收稿时间: | 6/8/2009 12:00:00 AM |
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