A Steady State Entanglement Witness

TL;DR

This paper introduces a thermodynamic entanglement witness method for steady state systems, demonstrating that energy currents can enhance detectable entanglement even at high temperatures.

Contribution

It proposes a novel steady state entanglement detection method using thermodynamic witnesses and shows how energy currents can increase entanglement detection.

Findings

Energy current enlarges entanglement detection region.

Entanglement persists at high steady state temperatures.

Energy current can increase the amount of entanglement.

Abstract

We present a method for entanglement detection in steady state systems using a thermodynamic witness. To illustrate, we consider an example and find that for an XX spin chain, the presence of an energy current increases the region of entanglement detected by the steady state witness. Further, we find that entanglement exists even at a high steady state temperature. We also discuss concurrence in the steady state system and find that the amount of entanglement can be increased by the current.