# Ground state cooling and high-fidelity quantum transduction via parametrically-driven bad-cavity optomechanics

## TL;DR

This paper introduces a cavity parametric driving method to suppress unwanted two-mode-squeezing interactions in optomechanics, enabling ground state cooling and high-fidelity quantum transduction without requiring a sideband-resolved cavity.

## Contribution

The authors propose a novel cavity parametric driving technique that cancels two-mode-squeezing interactions, improving optomechanical cooling and transduction in non-resonant cavities.

## Key findings

- Achieves mechanical ground state cooling below the quantum back-action limit.
- Significantly reduces output noise in sideband-unresolved transducers.
- Demonstrates robustness without the need for a deeply sideband-resolved cavity.

## Abstract

Optomechanical couplings involve both beam-splitter and two-mode-squeezing types of interactions. While the former underlies the utility of many applications, the latter creates unwanted excitations and is usually detrimental. In this work, we propose a simple but powerful method based on cavity parametric driving to suppress the unwanted excitation that does not require working with a deeply sideband-resolved cavity. Our approach is based on a simple observation: as both the optomechanical two-mode-squeezing interaction and the cavity parametric drive induce squeezing transformations of the relevant photonic bath modes, they can be made to cancel one another. We illustrate how our method can cool a mechanical oscillator below the quantum back-action limit, and significantly suppress the output noise of a sideband-unresolved optomechanical transducer.