Distant entanglement protected through artificially increased local temperature

TL;DR

This paper demonstrates that artificially increasing local temperature and monitoring reservoirs can protect entanglement in quantum systems, counteracting natural decoherence effects.

Contribution

It introduces a scheme for reservoir monitoring that can slow or suppress entanglement decay, applicable across various experimental platforms.

Findings

Entanglement decay can be slowed or suppressed with artificial temperature and reservoir monitoring.

The proposed scheme is robust against detection inefficiencies.

Applicable to multiple experimental setups like trapped ions and quantum dots.

Abstract

In composed quantum systems, the presence of local dissipative channels causes loss of coherence and entanglement at a rate that grows with the temperature of the reservoirs. However, here we show that if temperature is artificially added to the system, entanglement decay can be significantly slowed down or even suppressed conditioned on suitable local monitoring of the reservoirs. We propose a scheme to implement the joint reservoir monitoring applicable in different experimental setups like trapped ions, circuit and cavity QED or quantum dots coupled to nanowires and we analyze its general robustness against detection inefficiencies and non-zero temperature of the natural reservoir.