Atom-atom entanglement in a not-resonant two-photon Tavis-Cummings model

Marya O Guslyannikova,Eugene K Bashkirov,S Arakelyan,A Kalachev,A Naumov,A Evlyukhin

doi:10.1051/epjconf/201922003018

Marya O Guslyannikova, Eugene K Bashkirov + Show 4 more

Open Access

https://doi.org/10.1051/epjconf/201922003018

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Abstract

The entanglement between two two-level atoms (qubits) interacting not-resonantly with a one mode of thermal field in a lossless cavity via effective degenerate two-photon transitions is investigated. Based on the exact solution for the time-dependent density matrix of the system under consideration, negativity is calculated as a measure of the entanglement of atoms. The influence of a detuning on the dynamics of entanglement of atoms for separable and entangled initial atomic states and thermal cavity state is investigated.

Highlights

In the present paper we investigate the influence of the detuning on atom-atom entanglement induced by thermal cavity field for separable and entangled atomic states
We consider a system consisting of two effective two-level atoms with transition frequency 0 not-resonantly interacting with a single-mode thermal cavity field with frequency via degenerate two-photon transitions in a lossless cavity
Calculating the time behaviour of negativity, we have derived, firstly, that for separable initial atomic states a slight detuning can greatly enhance the degree of atom-atom entanglement induced by a thermal field

Summary

Introduction

We consider a system consisting of two effective two-level atoms with transition frequency 0 not-resonantly interacting with a single-mode thermal cavity field with frequency via degenerate two-photon transitions in a lossless cavity. In the present paper we investigate the influence of the detuning on atom-atom entanglement induced by thermal cavity field for separable and entangled atomic states. We introduce the atom-field detuning as = 0 2 .

Results

Conclusion