Influence of environment on quantum correlations in two-spin systems with dipole-dipole interactions

TL;DR

This paper investigates how environmental dephasing affects quantum correlations like entanglement and discord in a two-spin system with dipole interactions, highlighting their different sensitivities to relaxation.

Contribution

It provides a detailed analysis of the impact of dephasing on quantum correlations, comparing entanglement and discord within a dipole-coupled two-spin system.

Findings

Entanglement decreases with increasing relaxation rate.

Quantum discord exhibits different decay behavior than entanglement.

Environmental dephasing affects quantum correlations distinctly.

Abstract

An influence of environment on quantum correlations (entanglement and quantum discord) is studied in a two-spin-1/2 system with dipole-dipole interactions on the basis of Lindblad equation. We consider the simplest case when the environment causes only dephasing of system spins. The dependencies of entanglement and the quantum discord on the relaxation rate are obtained. We compare the influence of the environment on entanglement and quantum discord.