# A Quantum Heat Machine from Fast Optomechanics

## TL;DR

This paper explores a quantum thermodynamic machine using fast control of a harmonic oscillator, revealing novel behaviors like heat engine, refrigeration, and quantum squeezing, with potential implementation via pulsed optomechanics.

## Contribution

It introduces a fast-control regime for quantum heat machines, enabling access to unique quantum thermodynamic phenomena not possible in slower regimes.

## Key findings

- Demonstrates operation modes including heat engine and refrigeration.
- Shows transient cooling below cold bath temperature.
- Predicts rich quantum behaviors accessible through rapid squeezing.

## Abstract

We consider a thermodynamic machine in which the working fluid is a quantized harmonic oscillator that is controlled on timescales that are much faster than the oscillator period. We find that operation in this `fast' regime allows access to a range of quantum thermodynamical behaviors that are otherwise inaccessible, including heat engine and refrigeration modes of operation, quantum squeezing, and transient cooling to temperatures below that of the cold bath. The machine involves rapid periodic squeezing operations and could potentially be constructed using pulsed optomechanical interactions. The prediction of rich behavior in the fast regime opens up new possibilities for quantum optomechanical machines and quantum thermodynamics.