Evolution of field entropy and entanglement in the intensity-dependent two-mode Jaynes-Cummings model
Gao Yun-Feng (高云峰)a, Feng Jian (冯健)bc, Wang Ji-Suo (王继锁)b
a College of Educational Technology and Massmedium, Liaocheng University, Liaocheng 252059, China; b State Key Laboratory of Magnetic Resonance and Atomic and Molecular Physics, Wuhan Institute of Physics and Mathematics, Chinese Academy of Sciences，Wuhan 430071, China; c Institute of Optical Communication, Liaocheng University, Liaocheng 252059, China
Abstract The evolution of the entanglement degree of two-mode fields and atom with the intensity-dependent coupling is investigated by using von Neumann entropy. The results for the initial fields in both coherent states and two-mode squeezed vacuum state are calculated. The influence of the field intensity on the entropy is discussed. It is found that the field and atom are in maximum entanglement but go with periodic pulse disentanglement completely under the condition of strong initial field.
Received: 31 August 2004
Revised: 29 November 2004
Accepted manuscript online:
Fund: Project supported by the Natural Science Foundation of Shandong Province (Grant No.Y2004A09),China.
Cite this article:
Gao Yun-Feng (高云峰), Feng Jian (冯健), Wang Ji-Suo (王继锁) Evolution of field entropy and entanglement in the intensity-dependent two-mode Jaynes-Cummings model 2005 Chinese Physics 14 980
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