Controllable generation of mechanical quadrature squeezing via dark-mode engineering in cavity optomechanics

TL;DR

This paper demonstrates a method to generate strong, noise-resistant mechanical quadrature squeezing in cavity optomechanics by breaking the dark-mode effect using synthetic gauge fields, even at finite temperatures.

Contribution

It introduces a novel approach to break dark modes in multimode optomechanics, enabling robust mechanical squeezing at higher thermal phonon occupations.

Findings

Strong mechanical squeezing achieved by breaking dark modes.

Thermal-phonon-occupation tolerance increased by about three orders of magnitude.

Method generalized to multiple mechanical modes.

Abstract

Quantum squeezing is an important resource in modern quantum technologies, such as quantum precision measurement and continuous-variable quantum information processing. The generation of squeezed states of mechanical modes is a significant task in cavity optomechanics. Motivated by recent interest in multimode optomechanics, it becomes an interesting topic to create quadrature squeezing in multiple mechanical resonators. However, in the multiple-degenerate-mechanical-mode optomechanical systems, the dark-mode effect strongly suppresses the quantum effects in mechanical modes. Here we study the generation of mechanical squeezing in a two-mechanical-mode optomechanical system by breaking the dark-mode effect with the synthetic-gauge-field method. We find that when the mechanical modes work at a finite temperature, the mechanical squeezing is weak or even disappeared due to the dark-mode effect, while the strong mechanical squeezing can be generated once the dark-mode effect is broken. In particular, the thermal-phonon-occupation tolerance of the mechanical squeezing is approximately three orders of magnitude larger than that without breaking the dark-mode effect. We also generalize this method to break the dark modes and to create the mechanical squeezing in a multiple-mechanical-mode optomechanical system. Our results describe a general physical mechanism and pave the way towards the generation of noise-resistant quantum resources.