Robustness of different indicators of quantumness in the presence of dissipation

TL;DR

This paper compares how different indicators of quantumness, like entanglement and quantum discord, decay under dissipation in coupled harmonic oscillators, revealing entanglement's greater robustness.

Contribution

It provides a comparative analysis of various quantumness indicators' robustness against dissipation in harmonic oscillators, including phase diagrams.

Findings

Entanglement is more likely to survive asymptotically than twin oscillators correlations.

Quantum discord decays differently than entanglement under dissipation.

A phase diagram illustrates the conditions for the survival of different quantumness indicators.

Abstract

The dynamics of a pair of coupled harmonic oscillators in separate or common thermal environments is studied, focusing on different indicators of quantumness, such as entanglement, twin oscillators correlations and quantum discord. We compare their decay under the effect of dissipation and show, through a phase diagram, that entanglement is more likely to survive asymptotically than twin oscillators correlations.