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Manipulation of entanglement and preparation of quantum states for moving two-atom and the light field via intensity-dependent coupling

Liu Xiao-Juan Zhou Bing-Ju Liu Yi-Man Jiang Chun-Lei

Manipulation of entanglement and preparation of quantum states for moving two-atom and the light field via intensity-dependent coupling

Liu Xiao-Juan, Zhou Bing-Ju, Liu Yi-Man, Jiang Chun-Lei
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  • Received Date:  28 May 2012
  • Accepted Date:  20 June 2012
  • Published Online:  05 December 2012

Manipulation of entanglement and preparation of quantum states for moving two-atom and the light field via intensity-dependent coupling

  • 1. School of Physics, Hunan University of Science and Technology, Xiangtan 411201, China
Fund Project:  Project supported by the National Natural Science Foundation of China (Grant No. 11074072), the Hunan Province Natural Science (Xiangtan) Union Foundation of China (Grant No. 10JJ9002), the Hunan Province Natural Science Foundation of China (Grant No. 09JJ3012), the Education Bureau of Hunan Province, China (Grant No. 10A032), and the National Key Laboratory for Infrared Physics, Chinese Academy of Sciences (Grant Nos. 201118, 201119).

Abstract: In this paper, the Tavis-Cummings model is generalized to simultaneously consider the atomic motion and the field via intensity dependent coupling. Under the conditions of vacuum field, weakly and strongly coherent field, the entanglement evolution properties of two-atom-field and two-atom-two-atom are investigated using atomic reduced entropy and concurrence, respectively. According to evolution characteristics above, we prepare the W-class states of two-atom-field, two-atom Bell state, fidelity state of Bell-state atoms, single-photon state, two-photon state and stable number-states of field by selecting the interaction time of the two-atom-field, selecting the entanglement factor of the two-atom, regulating the field-mode structure parameter, controlling the probability amplitude of pure state of the system and selective measurement. The manipulation of two-atom Bell state sudden generation and its maintenance in a limited time, the formation of periodic quantum echo of Bell-state atoms and the continuous fidelity of Bell-state atomic information are achieved. The results show that the system has a powerful function of quantum information, and provide the physical carrier and theoretical parameters for experimental implementation of quantum information processing.

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