Generation of strong mechanical squeezing through the joint effect of two-tone driving and parametric pumping

TL;DR

This paper introduces a novel method combining two-tone driving and parametric pumping to generate strong, robust mechanical squeezing in optomechanical systems, surpassing traditional limits and resilient to noise.

Contribution

The study presents a new joint mechanism that enhances mechanical squeezing beyond the 3 dB limit using combined driving and pumping techniques.

Findings

Mechanical squeezing surpasses 3 dB limit.

Joint mechanism enhances squeezing significantly.

Robust against thermal noise and decay.

Abstract

We propose an innovative scheme to efficiently prepare strong mechanical squeezing through utilizing the synergistic mechanism of two-tone driving and parametric pumping in an optomechanical system. By reasonable choosing the system parameters, the proposal highlights the following prominent advantages: the squeezing effect of the cavity field induced by the optical parametric amplifier can be transferred to the mechanical oscillator, which has been squeezed by the two-tone driving, and the degree of squeezing of the mechanical oscillator will surpass that obtained by any single mechanism; the joint mechanism can enhance the degree of squeezing significantly and break the 3 dB mechanical squeezing limit, which is particularly evident in range where the red/blue-detuned ratio is sub-optimal; the mechanical squeezing achieved through this distinctive joint mechanism exhibits notable robustness against both thermal noise and decay of mechanical oscillator. Our project offers a versatile and efficient approach for generating strong mechanical squeezing across a wide range of conditions.