Quantum discord dynamical behaviors due to initial system-cavity correlations

TL;DR

This paper investigates how initial correlations between a two-qubit system and a cavity influence quantum discord dynamics, revealing that such correlations enhance and stabilize quantum discord over time.

Contribution

It demonstrates that initial system-cavity correlations can increase and sustain quantum discord, highlighting their significance in quantum information dynamics.

Findings

Initial correlations boost initial quantum discord.

Correlations lead to higher long-time quantum discord.

Quantum discord with initial correlations is more robust.

Abstract

We analyze the roles of initial correlations between the two-qubit system and a dissipative cavity on quantum discord dynamics of two qubits. Considering two initial system-cavity states, we show that the initial system-cavity correlations not only can initially increase the two-qubit quantum discord but also would lead to a larger long-time quantum discord asymptotic value. Moreover, quantum discord due to initial correlations is more robust than the case of the initial factorized state. Finally, we show the initial correlations' importance for dynamics behaviors of mutual information and classical correlation.