Enhancing quantum correlations and entanglement in an optomechanical system via cross-Kerr nonlinearity

TL;DR

This paper theoretically demonstrates that introducing cross-Kerr nonlinearity in an optomechanical system significantly enhances quantum entanglement and correlations, making them more robust and achievable at lower power levels.

Contribution

It reveals that cross-Kerr coupling can substantially improve quantum correlations in optomechanical systems under realistic conditions.

Findings

Enhanced steady-state entanglement at lower power

Robustness of entanglement against temperature

Dependence of quantum discord on nonlinearity

Abstract

In this work, we theoretically study the quantum correlations present in an optomechanical system by invoking an additional cross-Kerr coupling between the optical and mechanical mode. Under experimentally achievable conditions, we first show that a significant enhancement of the steady-state entanglement could be achieved at a considerably lower driving power, which is also extremely robust with respect to system parameters and environmental temperature. Then, we employ Gaussian quantum discord as a witness of the genuine quantumness of the correlation present in the system and discuss its dependence on the cross-Kerr nonlinearity.