# Heat Bath Algorithmic Cooled Quantum Otto Engines

## TL;DR

This paper proposes quantum Otto engines utilizing heat bath algorithmic cooling with partner pairing, replacing traditional isochoric cooling, leading to increased power and efficiency in liquid state NMR systems.

## Contribution

It introduces a novel quantum Otto engine design using heat bath algorithmic cooling, simplifying the entropy management and enhancing engine performance.

## Key findings

- Increased power output due to reduced cycle time.
- Higher thermal efficiency with the new cooling method.
- Effective use of a single entropy sink in quantum engines.

## Abstract

We suggest alternative quantum Otto engines, using heat bath algorithmic cooling with partner pairing algorithm instead of isochoric cooling. Liquid state nuclear magnetic resonance systems in one entropy sink are considered as working fluids. Then, the extractable work and thermal efficiency are analyzed in detail for four-stroke and two-stroke type of quantum Otto engines. The role of heat bath algorithmic cooling in these cycles is to use a single entropy sink instead of two. Also, this cooling algorithm increases the power of engines reducing the time required for one cycle.