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Journal of Zhuzhou Teachers College

Entropy Squeezing of a Two-level Atom in the Dissipative Approximation

Liao Xiang

Published Jan 1, 2006• 0 citations
OpenAlex

Abstract

The entropy squeezing of a two-level atom in the Jaynes-Cummings model in the dispersve approximation is investigated by the theory of quantum information entropy.It is shown that the entropy squeezing effect decreases with the increase of the dissipation and the field amplitude.When the field amplitude is small,the influence of dissipation on the the entropy squeezing effect is very small and can be not taken into account.

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The entropy squeezing of a two-level atom in the Jaynes-Cummings model in the dispersve approximation is investigated by the theory of quantum information entropy.It is shown that the entropy squeezing effect decreases with the increase of the dissipation and the field amplitude.When the field amplitude is small,the influence of dissipation on the the entropy squeezing effect is very small and can be not taken into account.
We study the squeezing for a two-level atom in the Jaynes-Cummings model with intensity-dependent coupling using quantum information entropy and examine the influences of the initial state of the system on the squeezed component number and direction of the information entropy squeezing. Our results show that, the squeezed component number depends on the atomic initial distribution angle, while the squeezed direction is determined by both the phases of the atom and the field for the information entropy squeezing. Quantum information entropy is shown to be a remarkable precision measure for atomic squeezing.
The field squeezing and the atomic dipole squeezing of a two-level atom in a dissipative cavity initially in vacuum are investigated.By means of exact solution of the master equation,the matrix elements of the density operator of the compound atom-field system are obtained.It is found that the cavity dissipation has an obvious influence on the atomic squeezing and the field squeezing under the resonant atom-field interaction.But the effects of the cavity dissipation on both squeezing will decrease under the off-resonance interaction condition.
We study the squeezing for a two-level atom in the Jaynes-Cumings model with intensity-dependent coupling using quantum information entropy,and examine the influences of the initial state of the system on the squeezed component number and direction of the information entropy squeezing.Our results show that,the squeezed component number depends on the atomic initial distribution angle,while the squeezed direction is determined by both the phases of the atom and the field for the information entropy squeezing.Quantum information entropy is shown to be a remarkable precision measure for atomic squeezing.
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The properties of the field quantum entropy evolution in a system of a single-mode squeezed coherent state field interacting with a two-level atom is studied by utilizing the complete quantum theory, and we focus our attention on the discussion of the influences of field squeezing parameter γ, atomic distribution angle θ and coupling strength g between the field and the atom on the properties of the evolution of field quantum entropy. The results obtained from numerical calculation indicate that the amplitude of oscillation of field quantum entropy evolution decreases with the increasing of squeezing parameter γ, and that both atomic distribution angle θ and coupling strength g between the field and the atom can influence the periodicity of field quantum entropy evolution.