Bringing entanglement to the high temperature limit

TL;DR

This paper demonstrates that entangled nonequilibrium states can exist at very high temperatures in driven, dissipative harmonic oscillators, challenging classical-quantum boundaries and enabling higher temperature quantum experiments.

Contribution

It introduces a method to achieve entanglement at high temperatures using parametrically driven coupled oscillators with dissipation.

Findings

Entanglement persists at temperatures much higher than previously possible.

High-temperature entangled states can be realized in driven harmonic oscillator systems.

Potential to increase operational temperature range of quantum experiments by an order of magnitude.

Abstract

We show the existence of an entangled nonequilibrium state at very high temperatures when two linearly coupled harmonic oscillators are parametrically driven and dissipate into two independent heat baths. This result has a twofold meaning: first, it fundamentally shifts the classical-quantum border to temperatures as high as our experimental ability allows us, and second, it can help increase by at least one order of magnitude the temperature at which current experimental setups are operated.