# Squeezed cooling of mechanical motion beyond the resolved-sideband limit

## TL;DR

This paper introduces a novel squeeze-and-cool scheme in cavity optomechanics that surpasses the resolved-sideband limit, enabling deeper cooling of mechanical resonators to below zero-point fluctuations.

## Contribution

The paper proposes a new noise squeezing-based cooling method that enhances optomechanical cooling beyond traditional limits.

## Key findings

- Achieves cooling below the zero-point fluctuations
- Demonstrates rapid and effective cooling technique
- Provides theoretical and numerical validation

## Abstract

Cavity optomechanics provides a unique platform for controlling micromechanical systems by means of optical fields that crosses the classical-quantum boundary to achieve solid foundations for quantum technologies. Currently, optomechanical resonators have become promising candidates for the development of precisely controlled nano-motors, ultrasensitive sensors and robust quantum information processors. For all these applications, a crucial requirement is to cool the mechanical resonators down to their quantum ground states. In this paper, we present a novel cooling scheme to further cool a micromechanical resonator via the noise squeezing effect. One quadrature in such a resonator can be squeezed to induce enhanced fluctuation in the other, "heated" quadrature, which can then be used to cool the mechanical motion via conventional optomechanical coupling. Our theoretical analysis and numerical calculations demonstrate that this squeeze-and-cool mechanism offers a quick technique for deeply cooling a macroscopic mechanical resonator to an unprecedented temperature region below the zero-point fluctuations.