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Chaos Solitons & Fractals

Entropy exchange and entanglement of an in motion two-level atom with a quantized field

Xue‐Qun Yan, Bin Shao, Jian Zou

Published Nov 21, 2006• 12 citations
Publisher
DOI
10.1016/j.chaos.2006.09.087

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The entanglement dynamics of a two-level atom with center-of-mass motion in a single-mode quantized field is investigated.The behavior of the entropy changes of the subsystems,as well as the concurrence of the coupled atom-field system is explored.These results show that when the atom is initially prepared in ground state anti-correlation behavior occurs,but a positively correlated behavior appears gradually as the increasing of the probability of the atom initially in excited state.Also,the amplitude of the concurrence increases with the increasing of the probability of the atom initially in excited state.In addition,with increasing of the atomic center-of-mass motion,both the amplitudes of the partial entropy changes and the concurrence are reduced.

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Considering a moving two-level atom interacting with a single-mode thermal field through multi-photon process, in this paper we study the entropy exchange between the atom and the field by using quantum partial entropy and entanglement measured by using Concurrence, and investigate the effects of the initial atomic state, the atomic motion, the mean photon number and the transition photon number on entropy and entanglement. The results show that the entropy exchange and the entanglement exhibit the periodic evolution due to atomic motion, and entropy exchange occurs. The entanglement between the atom and the field is strengthened as the transition photon number increases. When the partial entropy exchange between atom and field is zero, the entanglement is also zero.
The entanglement dynamics of a two-level atom with center-of-mass motion in a single-mode quantized field is investigated.The behavior of the entropy changes of the subsystems,as well as the concurrence of the coupled atom-field system is explored.These results show that when the atom is initially prepared in ground state anti-correlation behavior occurs,but a positively correlated behavior appears gradually as the increasing of the probability of the atom initially in excited state.Also,the amplitude of the concurrence increases with the increasing of the probability of the atom initially in excited state.In addition,with increasing of the atomic center-of-mass motion,both the amplitudes of the partial entropy changes and the concurrence are reduced.