# Breaking optomechanical cooling limit by two drive fields on a membrane-in-middle system

## TL;DR

This paper proposes a theoretical method using two drive fields in a membrane-in-middle optomechanical system to surpass the traditional cooling limit, achieving significantly lower phonon numbers.

## Contribution

It introduces a novel two-drive scheme that enables ground state cooling beyond the single-drive theoretical limit in optomechanical systems.

## Key findings

- Two-drive setup can outperform single-drive cooling limits.
- Proper parameter tuning enhances cooling efficiency.
- Potential to reduce thermal phonons by an order of magnitude.

## Abstract

We present a theoretical scheme for ground state cooling of a mechanical resonator in a membrane-in-middle optomechanical system (OMS) driven by two red-detuned drive fields. The details of dynamical evolution of OMS are provided, and the effect of system conditions on cooling results are systematically studied. Most importantly, the setups with two drives are found to be capable of achieving better cooling results than the theoretical cooling limit with single cavity. Even an improvement by one order of thermal phonon number is possible with proper combination of the cavity damping rate and drive intensity.