Saturable nonlinearity induced quantum correlations in optomechanics

TL;DR

This paper introduces a scheme using saturable nonlinearity in optomechanical systems to generate and enhance quantum correlations like entanglement and steering, even at room temperature.

Contribution

It demonstrates how saturable nonlinearity can be used to induce and control quantum correlations in optomechanical systems, a novel approach for quantum information applications.

Findings

Quantum correlations are generated only when nonlinearities are active.

Induced losses enhance quantum correlations more effectively than gain.

Quantum correlations remain robust against thermal fluctuations.

Abstract

We propose a scheme that induces quantum correlations in optomtomechanical systems. Our benchmark system consists of two optically coupled optical cavities which interact with a common mechanical resonator. The optical cavities host saturable nonlinearity which triggers either gain or losses in each cavity. Without these nonlinearities, there are no quantum correlations, i.e., entanglement and steering, generated in the system. By turning on the nonlinearities, gain and losses are switched on, enabling flexible generation of both quantum entanglement and quantum steering in our proposal. These generated quantum correlations seem to be insensitive to the induced gain, while the induced losses through saturation effect efficiently enhance quantum correlations. Moreover, the robustness of the generated quantum correlations against thermal fluctuations is further improved under nonlinear saturation scenario. This work suggests a way of using nonlinear saturation effects to engineer quantum correlations even at room temperature, which are useful for quantum information processing, quantum computational tasks, and quantum technologies.