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机构地区:[1]Zhejiang Institute of Modern Physics and Department of Physics,Zhejiang University
出 处:《Chinese Physics B》2009年第6期2288-2293,共6页中国物理B(英文版)
基 金:Project supported by the National Natural Science Foundation of China (Grant No 10774131);the National Key Project for Fundamental Research of China (Grant No 2006CB921403)
摘 要:We investigate the entanglement of a three-level atom in A configuration interacting with two quantized field modes by using logarithmic negativity. Then, we study the relationship of the atomic coherence and the entanglement between two fields which are initially prepared in vacuum or thermal states. We find that if the two fields are prepared in thermal states, the atomic coherence can induce the entanglement between two thermal fields. However, there is no coherence-induced entanglement between two vacuum fields.We investigate the entanglement of a three-level atom in A configuration interacting with two quantized field modes by using logarithmic negativity. Then, we study the relationship of the atomic coherence and the entanglement between two fields which are initially prepared in vacuum or thermal states. We find that if the two fields are prepared in thermal states, the atomic coherence can induce the entanglement between two thermal fields. However, there is no coherence-induced entanglement between two vacuum fields.
关 键 词:quantum entanglement COHERENCE cavity QED
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