# Strong mechanical squeezing in an unresolved-sideband optomechanical system

## TL;DR

This paper demonstrates how to achieve strong mechanical squeezing beyond 3 dB in an unresolved-sideband optomechanical system by using reservoir engineering and quantum interference to suppress counter-rotating effects.

## Contribution

It introduces a novel method for strong mechanical squeezing in unresolved-sideband systems using auxiliary cavities and quantum interference.

## Key findings

- Achieved mechanical squeezing beyond 3 dB.
- Developed an analytical condition for maximum squeezing.
- Showed suppression of counter-rotating terms via quantum interference.

## Abstract

We study how strong mechanical squeezing (beyond 3 dB) can be achieved through reservoir engineering in an optomechanical system which is far from the resolved-sideband regime. In our proposed setup, the effect of unwanted counter-rotating terms is suppressed by quantum interference from two auxiliary cavities. In the weak coupling regime we develop an analytical treatment based on the effective master equation approach, which allows us to obtain explicitly the condition of maximum squeezing.