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Acta Physica Polonica A

The Control of Entanglement in a Damped Jaynes-Cummings Model by Transient Effects

Hünkar Kayhan

Published Sep 1, 2015• 0 citations
Publisher

Abstract

In this work, we study the entanglement dynamics of the damped JaynesCummings model with the transient eects modeled as the linear sweep of the coupling coecient between the atom and the eld.We show that the decoherence of the entanglement can be controlled by the transient eects under the inuence of damping.These eects can accelerate and can decelerate the decoherence of the entanglement during the time-evolution of the system, by adjusting the frequency of the Rabi oscillations.

DOI
10.12693/aphyspola.128.256

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In this work, we study the entanglement dynamics of the damped JaynesCummings model with the transient eects modeled as the linear sweep of the coupling coecient between the atom and the eld.We show that the decoherence of the entanglement can be controlled by the transient eects under the inuence of damping.These eects can accelerate and can decelerate the decoherence of the entanglement during the time-evolution of the system, by adjusting the frequency of the Rabi oscillations.
In this paper, we investigate the dynamics of entropy exchange and entanglement in the atom-…eld interaction by the Jaynes-Cummings model in the presence of the transient e¤ects considered for the case of linear sweep.We …nd that the transient e¤ects do not in ‡uence the entropy exchange between the atom and the …eld.As the strength of these e¤ects increases, the oscillations of the entropy change and entanglement speed up.The entanglement behaves chaotically as the transient e¤ects become stronger
Abstract The entanglement between two stationary qubits is a kind of valuable quantum resources in quantum information or quantum network. This paper investigates the time evolution of the entanglement between two atoms, which are initially prepared in the Bell states and each of which interacts with its own cavity field in the identical and non-identical double damping Jaynes-Cummings (J-C) system. It mainly considers the effect of the atomic spontaneous decay Γ and the decay of cavity field κ on the two-qubit entanglement in such system. While causing the decay of entanglement, Γ and κ can also play a positive role in the entanglement evolution, which may imply a way to better control and maintain the entanglement. What is more, the rules governing the transfer of entanglement between two-qubit subsystems in strong coupling regime are finally studied by taking Γ and κ into consideration .
An extension of the standard one-photon as well as the two-photon Jaynes-Cummings (JC) model has been done to include transient effects due to a modulation of the atom-field coupling coefficient. An explicit time dependence is given for the case of a linear sweep of the coupling parameter. We have shown the effects of such a sweep on the dynamical evolution of a two-level atom undergoing a one- or two-photon process in a single nondecaying mode of the field in a coherent state. The statistical aspects of the field, such as intensity-intensity correlation and squeezing, are also investigated and are found to be both qualitatively as well as quantitatively different from the standard JC models.