Large and robust mechanical squeezing of optomechanical systems in a highly unresolved sideband regime via Duffing nonlinearity and intracavity squeezed light

TL;DR

This paper presents a scheme to achieve strong, robust mechanical squeezing in optomechanical systems operating in the highly unresolved sideband regime by leveraging Duffing and optical nonlinearities, overcoming previous limitations.

Contribution

The study introduces a novel method combining mechanical and optical nonlinearities to generate large, robust squeezing in the HURSB regime, which was previously challenging.

Findings

Mechanical squeezing exceeds 3dB in HURSB regime.

Squeezing remains robust against thermal fluctuations.

Optical and mechanical nonlinearities synergistically enhance squeezing.

Abstract

We propose a scheme to generate strong and robust mechanical squeezing in an optomechanical system in the highly unresolved sideband (HURSB) regime with the help of the Duffing nonlinearity and intracavity squeezed light. The system is formed by a standard optomechanical system with the Duffing nonlinearity (mechanical nonlinearity) and a second-order nonlinear medium (optical nonlinearity). In the resolved sideband regime, the second-order nonlinear medium may play a destructive role in the generation of mechanical squeezing. However, it can significantly increase the mechanical squeezing (larger than 3dB) in the HURSB regime. Finally, we show the mechanical squeezing is robust against thermal fluctuations of the mechanical resonator. The generation of large and robust mechanical squeezing in the HURSB regime is a combined effect of the mechanical and optical nonlinearities.