Preparation and control of entangled states in the two-mode coherent fields interacting with a moving atom via two-photon process |
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Authors: | Liu Xiao-Juan Zhou Bing-Ju Liu Ming-Wei and Li Shou-Cun |
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Institution: | Department of Physics, Hunan University of Science and Technology, Xiangtan 411201, China;Anhui Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Hefei 230031, China |
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Abstract: | We investigate the preparation and the control of entangled
states in a system with the two-mode coherent fields interacting
with a moving two-level atom via the two-photon transition. We
discuss entanglement properties between the two-mode coherent
fields and a moving two-level atom by using the quantum reduced
entropy, and those between the two-mode coherent fields by using
the quantum relative entropy. In addition, we examine the
influences of the atomic motion and field-mode structure
parameter $p$ on the quantum entanglement of the system. Our
results show that the period and the duration of the prepared
maximal atom-field entangled states and the frequency of maximal
two-mode field entangled states can be controlled, and that a
sustained entangled state of the two-mode field, which is
independent of atomic motion and the evolution time, can be
obtained, by choosing appropriately the parameters of atomic
motion, field-mode structure, initial state and interaction time
of the system. |
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Keywords: | two-mode coherent fields entangled states reduced entropy relative entropy atomic
motion and field-mode structure |
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