Huazhong Normal Univ, Dept Phys, Wuhan 430079, Peoples R China
; Huazhong Normal Univ, Dept Informat Management, Wuhan 430079, Peoples R China
; Huazhong Normal Univ, Sch Nat Sci, Wuhan 430079, Peoples R China
; Inst High Energy Phys, Beijing 100049, Peoples R China
The dynamical properties of quantum entanglement in the integrable Jaynes-Cummings model with a Kerr nonlinearity are studied in terms of the reduced-density linear entropy with various Kerr coupling parameters and initial states, where the initial states are prepared by the coherent states placed in the corresponding phase space described in terms of canonical variables. The mean entanglement averaged over time is employed to investigate the behavior of entanglement of those coherent states. It is shown that the mean entanglement of the coherent states put near the centers of periodic orbits, both with a strong Kerr coupling and without a Kerr coupling, tends to be the minimal, and that the mean entanglement of the coherent states centered near the boundary with a strong Kerr coupling is the minimal while that without Kerr coupling is the maximal. (c) 2006 Elsevier B.V. All rights reserved.