# Pulsed Generation of Quantum Coherences and Non-classicality in Light-Matter Systems

## TL;DR

This paper demonstrates how pulsed stimuli can generate many-body quantum coherences and non-classical states in light-matter systems, with implications for nanosystems and biological processes, without requiring strong coupling.

## Contribution

It provides an exact real-time analysis of driven light-matter systems showing novel quantum coherences arising from pulsed stimuli, applicable to general system sizes and conditions.

## Key findings

- Quantum coherences depend on stimulus speed.
- Non-classicalities are robust to noise and losses.
- Applicable to various nanosystems and biological processes.

## Abstract

We show that a pulsed stimulus can be used to generate many-body quantum coherences in light-matter systems of general size. Specifically, we calculate the exact real-time evolution of a driven, generic out-of-equilibrium system comprising an arbitrary number N qubits coupled to a global boson field. A novel form of dynamically-driven quantum coherence emerges for general N and without having to access the empirically challenging strong-coupling regime. Its properties depend on the speed of the changes in the stimulus. Non-classicalities arise within each subsystem that have eluded previous analyses. Our findings show robustness to losses and noise, and have potential functional implications at the systems level for a variety of nanosystems, including collections of N atoms, molecules, spins, or superconducting qubits in cavities -- and possibly even vibration-enhanced light harvesting processes in macromolecules.