Quantum Correlations Between Identical and Unidentical Atoms in a Dissipative Environment

TL;DR

This paper investigates how quantum correlations like entanglement, Bell-nonlocality, and quantum discord evolve between identical and unidentical atoms in a dissipative cavity environment, revealing conditions for their creation and preservation.

Contribution

It provides new insights into the dynamics of quantum correlations under dissipation, including the generation of high quantum discord despite entanglement loss.

Findings

Quantum discord can be generated even with strong dissipation.

Entanglement and Bell nonlocality remain zero for initially separable states.

Cavity decay can lead to stationary states with high quantum correlations.

Abstract

We have studied the dynamics of quantum correlations such as entanglement, Bell-nonlocality and quantum discord between identical as well as unidentical atoms interacting with a single-mode cavity field and subject to cavity decay. The effect of single atom detuning, cavity decay rate and initial preparation of the atoms on the corresponding correlation measures have been investigated. It is found that even under strong dissipation, time evolution can create high quantum discord while entanglement and Bell nonlocality stay zero for an initially separable state. Quantum discord increases while entanglement decreases in a certain time period under dissipation for the initial state that both atoms are in the excited state if the qubits are identical. For some type of initial states, cavity decay is shown to drive the system to a stationary state with high entanglement and quantum discord.