Effects of classical environmental noise on entanglement and quantum discord

TL;DR

This paper investigates how classical environmental noise affects the dynamics of quantum correlations, such as entanglement and quantum discord, in two non-interacting qubits, revealing different behaviors in Markovian and non-Markovian regimes.

Contribution

It provides a comparative analysis of static and dynamic classical noise effects on quantum correlations in different environmental regimes.

Findings

Markovian noise causes monotone decay of correlations.

Non-Markovian noise can induce sudden death and revival of correlations.

Separate and common environments can either preserve or diminish quantum correlations depending on the noise regime.

Abstract

We address the effect of classical noise on the dynamics of quantum correlations, entanglement and quantum discord, of two non-interacting qubits initially prepared in a Bell state. The effect of noise is modeled by randomizing the single-qubit transition amplitudes. We address both static and dynamic environmental noise corresponding to interaction with separate common baths in either Markovian and non-Markovian regimes. In the Markov regime, a monotone decay of the quantum correlations is found, whereas for non-Markovian noise sudden death and revival phenomena may occur, depending on the characteristics of the noise. Entanglement and quantum discord show the same qualitative behavior for all kind of noises considered. On the other hand, we find that separate and common environments may play opposite roles in preserving quantum correlations, depending on the noise regime considered.