Light-matter quantum dynamics of complex laser-driven systems

TL;DR

This paper introduces a new approximation method for analyzing complex quantum light-matter systems, enabling simplified descriptions and revealing phenomena like entanglement and nonclassical light generation.

Contribution

The authors develop a novel approximation inspired by the Born-Oppenheimer approach, allowing decoupling of light and matter in fully-quantized systems.

Findings

Demonstration of light-mode entanglement

Prediction of nonclassical light generation

Simplified equations for light-matter interaction

Abstract

We propose a novel general approximation to transform and simplify the description of a complex fully-quantized system describing the interacting light and matter. The method has some similarities to the time-dependent Born-Oppenheimer approach: we consider a quantum description of light rather than of nuclei and follow a similar separation procedure. Our approximation allows to obtaing a decoupled system for the light-excited matter and "dressed" light connected parametrically. With these equations at hand, we study how intense light as a quantum state is affected due to the back-action of the interacting matter. We discuss and demonstrate the possibility of the light-mode entanglement and nonclassical light generation during the interaction.