Frozen and Invariant Quantum Discord under Local Dephasing Noise

TL;DR

This paper reviews the dynamical behavior of quantum discord, focusing on phenomena like invariance and freezing under local dephasing noise, and explores their relation to non-Markovian dynamics and decoupling protocols.

Contribution

It provides a comprehensive review of the conditions leading to invariant and frozen quantum discord in open quantum systems, highlighting their connection to non-Markovian effects and control techniques.

Findings

Quantum discord can remain invariant or frozen under certain noise conditions.

Non-Markovian dynamics play a key role in the behavior of quantum discord.

Dynamical decoupling protocols can influence the preservation of quantum discord.

Abstract

In this chapter, we intend to explore and review some remarkable dynamical properties of quantum discord under various different open quantum system models. Specifically, our discussion will include several concepts connected to the phenomena of time invariant and frozen quantum discord. Furthermore, we will elaborate on the relation of these two phenomena to the non-Markovian features of the open system dynamics and to the usage of dynamical decoupling protocols.