# Quantum optomechanics beyond the quantum coherent oscillation regime

## TL;DR

This paper presents a pulsed optomechanical protocol enabling quantum control and sensing beyond the quantum coherent oscillation regime, overcoming decoherence limitations in thermal environments.

## Contribution

The authors introduce a novel pulsed protocol that achieves quantum state manipulation and sensing without relying on quantum coherent oscillations, expanding quantum optomechanics capabilities.

## Key findings

- Enables ground state cooling in high thermal environments
- Allows quantum non-demolition measurements without coherent oscillations
- Breaks thermal limits for impulse force sensing

## Abstract

Interaction with a thermal environment decoheres the quantum state of a mechanical oscillator. When the interaction is sufficiently strong, such that more than one thermal phonon is introduced within a period of oscillation, quantum coherent oscillations are prevented. This is generally thought to preclude a wide range of quantum protocols. Here, we introduce a pulsed optomechanical protocol that allows ground state cooling, general linear quantum non-demolition measurements, optomechanical state swaps, and quantum state preparation and tomography without requiring quantum coherent oscillations. Finally we show how the protocol can break the usual thermal limit for sensing of impulse forces.