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Physica A Statistical Mechanics and its Applications

Entropy evolution of field interacting with V-type three-level atom via intensity-dependent coupling

Chunjia Huang, Lijun Tang, Fanzhi Kong, Jiayuan Fang, Ming Zhou

Published Mar 1, 2006• 34 citations
Publisher
DOI
10.1016/j.physa.2006.01.060

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We investigate the evolution of the atomic quantum entropy and the atom-field entanglement in a system of a Ξ-configuration three-level atom interacting with a single-mode field with additional forms of nonlinearities of both the field and the intensity-dependent atom-field coupling. With the derivation of the unitary operator within the frame of the dressed state and the exact results for the state of the system, we perform a careful investigation of the temporal evolution of the entropy. A factorization of the initial density operator is assumed, considering the field to be initially in a squeezed coherent or binomial state. The effects of the mean photon number, detuning, Kerr-like medium and the intensity-dependent coupling functional on the entropy are analyzed.

International Journal of Modern Physics B•Apr 10, 2009•4 citations
The evolution properties of the entropy of a single-mode light field interacting with the V-type three-level atom via intensity-dependent coupling have been studied. The discussion is centered on the influence of detuning and initial photon number on the field entropy evolution. The results show that the behavi or of the field entropy is non-periodic for the cases of small detuning and weak initial light field,being similar to the single-photon Jaynes-Cummings model (JCM). On the contrary,the field entropy evolution is periodic for the cases of large detuning or strong initial light field,being similar to the two-photon JCM
The evolution properties of the entropy of squeezed field interacting with the V-type three level atom via intensity-dependent coupling have been studied.The discussion is focused on the influence of the detuning and initial squeezing factor of light on the field entropy.The results show that the field entropy value rises with the increasing of initial squeezing factor of light.When the squeezing factor is smaller,the field entropy evolution is periodic and this periodicity vanishes gradually with the increasing of initial squeezing factor of light.The detuning influences remarkably on the field entropy which oscilates irregularly with the increasing of detuning.
We investigate the evolution of the atomic quantum entropy and the atom-field entanglement in a system of a Ξ-configuration three-level atom interacting with a single-mode field with additional forms of nonlinearities of both the field and the intensity-dependent atom-field coupling. With the derivation of the unitary operator within the frame of the dressed state and the exact results for the state of the system, we perform a careful investigation of the temporal evolution of the entropy. A factorization of the initial density operator is assumed, considering the field to be initially in a squeezed coherent or binomial state. The effects of the mean photon number, detuning, Kerr-like medium and the intensity-dependent coupling functional on the entropy are analyzed.