Dynamics of quantum correlations in two-qubit systems within non-Markovian environments

TL;DR

This paper reviews recent findings on how quantum correlations like entanglement and discord evolve in two-qubit systems within non-Markovian environments, emphasizing memory effects and their impact on quantum information processing.

Contribution

It provides a comprehensive overview of the dynamics of quantum correlations in non-Markovian environments, highlighting phenomena like entanglement revivals and discord behavior.

Findings

Entanglement can revive in non-Markovian environments.

Quantum discord exhibits revival phenomena in non-Markovian channels.

Memory effects significantly influence the dynamics of quantum correlations.

Abstract

Knowledge of the dynamical behavior of correlations with no classical counterpart, like entanglement, nonlocal correlations and quantum discord, in open quantum systems is of primary interest because of the possibility to exploit these correlations for quantum information tasks. Here we review some of the most recent results on the dynamics of correlations in bipartite systems embedded in non-Markovian environments that, with their memory effects, influence in a relevant way the system dynamics and appear to be more fundamental than the Markovian ones for practical purposes. Firstly, we review the phenomenon of entanglement revivals in a two-qubit system for both independent environments and a common environment. We then consider the dynamics of quantum discord in non-Markovian dephasing channel and briefly discuss the occurrence of revivals of quantum correlations in classical environments.