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Controlling entanglement sudden birth and sudden death of two-atom X-states in Tavis-Cummings model

Shan Chuan-Jia Liu Ji-Bing Chen Tao Liu Tang-Kun Huang Yan-Xia Li Hong

Controlling entanglement sudden birth and sudden death of two-atom X-states in Tavis-Cummings model

Shan Chuan-Jia, Liu Ji-Bing, Chen Tao, Liu Tang-Kun, Huang Yan-Xia, Li Hong
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  • Received Date:  28 March 2009
  • Accepted Date:  26 January 2010
  • Published Online:  05 May 2010

Controlling entanglement sudden birth and sudden death of two-atom X-states in Tavis-Cummings model

  • 1. College of Physics and Electronic Science, Hubei Normal University, Huangshi 435002,China

Abstract: In this paper, we investigate the entanglement dynamics of two entangled two-level atoms with initial X state and dipole-dipole coupling intensity in Tavis-Cummings model. The interesting phenomena of entanglement sudden death as well as sudden birth appear during the evolution process. We analyze in detail the effect of purity of initially entangled state of two atoms, the dipole-dipole coupling intensity between two atoms, and the field in the Fock state on the apparition time of entanglement sudden death and entanglement sudden birth. Furthermore, the conditions for the conversion of entanglement sudden death and entanglement sudden birth can be generalized when the initial entangled state is not pure. The results show that the above system parameters affect the concurrence, entanglement sudden birth and sudden death remarkably, the dipole-dipole coupling intensity affects amplitudes of the concurrence oscillation and leads time interval of the ESD to decrease. With the increasing of the purity, the time of entanglement sudden death and entanglement sudden birth will decrease, it is also notable that invariant and stable entanglement, which can be controlled by different initial states of the atoms, occurs for particular initial X state.

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