# Quantum Coherence from Periodic Driving with Laser Pulses and Decay

## TL;DR

This paper demonstrates that controlled periodic driving and dissipation in a central spin model can generate and preserve quantum coherence, counteracting typical heating effects in non-equilibrium systems.

## Contribution

It introduces a method to produce and maintain quantum coherent states through tailored driving and dissipation in a central spin system, with experimental relevance.

## Key findings

- Quantum coherence can be sustained via periodic driving with dissipation.
- Entropy reduction indicates the formation of coherent states.
- The approach is applicable to quantum dots and molecules.

## Abstract

Non-equilibrium physics is a particularly fascinating field of current research. Generically, driven systems are gradually heated up so that quantum effects die out. In contrast, we show that a driven central spin model including controlled dissipation in a highly excited state allows us to distill quantum coherent states, indicated by a substantial reduction of entropy. The model is experimentally accessible in quantum dots or molecules with unpaired electrons. The potential of preparing and manipulating coherent states by designed driving potentials is pointed out.