Noise-tolerant tripartite entanglement and quantum coherence via saturation effects

TL;DR

This paper proposes a scheme to generate highly resilient tripartite entanglement and quantum coherence that are robust against thermal fluctuations, using saturation effects in a driven optomechanical system, with potential for room-temperature quantum technologies.

Contribution

The study introduces a novel approach leveraging saturation nonlinearities to significantly enhance thermal robustness of quantum resources in optomechanical systems.

Findings

Tripartite entanglement is enhanced up to tenfold with saturation effects.

Quantum coherence shows moderate improvement due to saturation nonlinearities.

Thermal phonon threshold for entanglement preservation is increased by two orders of magnitude.

Abstract

Engineering quantum resources that survive against environmental temperature is of great interest for modern quantum technologies. However, it is a tricky task to synthetize such quantum states. Here, we propose a scheme to generate highly resilient tripartite entanglement and quantum coherence against thermal fluctuations. Our benchmark model consists of a mechanical resonator driven by two electromagnetic fields, which are optically coupled. A modulated photon hopping $J$ captures the optical coupling, and each optical cavity hosts saturable gain or loss. When the saturable gain/loss are off, we observe a slightly enhancement of both tripartite entanglement and quantum coherence for an appropriate tuning of the phase modulation. When the saturation effects are turned on, we observe a significant enhancement of the tripartite entanglement, up to one order of magnitude, together with a moderate improvement of the quantum coherence. More interestingly, our results show that the threshold thermal phonon mumber for preserving tripartite entanglement in our proposal has been postponed up to two order of magnitude stronger than when the saturation effects are not accounted. The inclusion of saturable gain/loss in our proposal induces noise-tolerant quantum resources, and may lead to room temperature quantum applications such as quantum information processing, and quantum computional tasks. Our findings are quite general, and suggest saturation nonlinear effects as a tool for engineering thermal-immune quantum correlations.