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Physics of Wave Processes and Radio Systems

Entanglement between atoms succesively passing the cavity with thermal field

Eugene K. Bashkirov, Башкиров Е. К, T. S Mastyugina, Мастюгина Т. С

Published Dec 15, 2015• 0 citations
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Abstract

In the present paper the entanglement dynamics of two atoms succesively passing the one-atom maser cavity with finite temperature has been considered. The influence of the initial atomic coherence and intensity of the thermal cavity field on the degree of the atomic entanglement has been investigated. It has been shown that the interaction between atoms and cavity low-intensity thermal field leads to entanglement for all initial atomic states and the initial atomic coherence leads to decreasing of the degree of the entanglement.

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We have investigated the influence of dipole-dipole interaction and initial atomic coherence on atomic entanglement dynamics of two qubits. We have considered a model, in which only one atom couples to a quantum electromagnetic field in a cavity, since one of them can move around the cavity. We have shown that the entanglement arises for all pure atomic state even when both atoms are initially in the excited states. We have also derived that degree of entanglement is enhanced in the presence of the atomic coherence.
We have investigated the influence of dipole-dipole interaction and initial atomic coherence on atomic entanglement dynamics of two qubits. We have considered a model, in which only one atom couples to a quantum electromagnetic field in a cavity, since one of them can move around the cavity. We have shown that the entanglement arises for all pure atomic state even when both atoms are initially in the excited states. We have also derived that degree of entanglement is enhanced in the presence of the atomic coherence.
In this paper, we have investigated the entanglement between two dipole coupled two-level atoms. The model, in which only one atom is trapped in an lossless cavity and interacts with single-mode thermal field, and the other one can be spatially moved freely outside the cavity has been carried out. We have considered the effect of the atomic coherence on the entanglement behavior. We have shown that a thermal field might cause high entanglement between the atoms both for coherent and incoherent initial atomic states only for small values of the cavity mean photon number. In the considered model the atoms would get entangled even when both atoms are initially in the excited state. We have also derived that the degree of entanglement is weakly dependent on the strength of dipole-dipole interaction for coherent initial states.