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PAIRWISE ENTANGLEMENT DYNAMICS OF A MULTIPARTITE SYSTEM IN THE TAVIS–CUMMINGS MODEL

FENG HAN

Department of Physics and Information Engineering, Jining University, Qufu 273155, China

College of Physics and Engineering, Qufu Normal University, Qufu 273165, China

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and

YUN-JIE XIA

College of Physics and Engineering, Qufu Normal University, Qufu 273165, China

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https://doi.org/10.1142/S0219749909005821Cited by:1 (Source: Crossref)

Abstract

The pairwise entanglement dynamics in a multipartite system consisting of three two-level atoms A, B, C and a single-mode cavity field a is studied via negativity. Three atoms are arranged in such a way that atoms BC are embedded in and locally interact with the cavity while atom A is located in a spatially separate place outside of the cavity. Initially, atom-pair AB is prepared in a Bell-like state while atom C in a superposition of ground and excited state, |g_C〉 and |e_C〉. It shall be shown that all the pairwise negativities of the total system including atoms and cavity undergo qualitatively different evolutions. The so-called entanglement sudden death is observed for atom-pair AB under certain conditions and the entanglement transfer among all the possible degrees of freedom of the whole system is also discussed.

Keywords:

PACS: 03.65.Ud, 03.65.Yz, 03.67.Mn

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