Abstract The entanglement dynamics of system, where atoms A and B interact with single mode cavity fields a and b respectively, is studied. The interaction between atom A and cavity a may be described by using the typical Jaynes--Cummings model, while that between the atom B and cavity b filled with a Kerr medium is of a two-photon process. For a certain initial atom entanglement state, there is an entanglement sudden death effect between the two atoms. The Kerr medium in the cavity b can effectively prevent the undesirable entanglement sudden death from occurring. Also, from the viewpoint of the population dynamics, we discuss why the Kerr medium can do so.
Received: 13 May 2008
Revised: 20 June 2008
Accepted manuscript online:
(Phase conjugation; photorefractive and Kerr effects)
Fund: Project
supported by the National
Natural Science Foundation of
China (Grant Nos 10535010 and 10775123), and the Research Foundation
from Ministry of Education of China (contract No 20070284016).
Cite this article:
Zheng Qiang(郑强), Zhang Xiao-Ping(张小平), and Ren Zhong-Zhou(任中洲) Control of entanglement sudden death by Kerr medium 2008 Chin. Phys. B 17 3553
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