Temperature dependent quantum correlations in three dipolar coupled two-level atoms

TL;DR

This paper explores how temperature and dipole coupling influence quantum entanglement in three dipolar two-level atoms arranged in line and loop configurations, revealing unique entanglement properties specific to the loop setup.

Contribution

It demonstrates that loop configuration uniquely exhibits entanglement between one atom and the other two, a feature absent in the line configuration, and shows how to tune quantum correlations via temperature and coupling.

Findings

Loop configuration shows atom entanglement with the other two, unlike line configuration.

Quantum correlations can be tuned by temperature and dipole coupling.

Entanglement features are configuration-specific and temperature-dependent.

Abstract

We investigate the thermal entanglement characteristics of three dipole-coupled two-level atoms arranged in two different configurations - in a line with nearest neighbour coupling and in a closed loop with each atom interacting with both its neighbours. It is observed that in loop configuration, any one of the three atoms is indeed entangled with the other two atoms in the system, which are not mutually entangled, and further that this feature is specific to only the loop configuration, which is markedly absent in the line configuration. A detailed study of the quantum correlations demonstrated how these can be tuned by varying the temperature and the dipole dipole coupling strength, in both the configurations.