Atom-field dressed states in slow-light waveguide QED

TL;DR

This paper analyzes atom-photon bound states in waveguide QED systems, exploring their spectral features and impact on atom interactions, providing insights into strong-coupling phenomena in optical and microwave platforms.

Contribution

It offers a detailed analysis of single- and multi-photon dressed states and their influence on dipole-dipole interactions in waveguide QED, advancing understanding of strong coupling effects.

Findings

Bound states are formed by an atom and localized photonic excitations.

Formation of bound states modifies waveguide-mediated dipole-dipole interactions.

The analysis applies to both optical and microwave waveguide QED systems.

Abstract

We discuss the properties of atom-photon bound states in waveguide QED systems consisting of single or multiple atoms coupled strongly to a finite-bandwidth photonic channel. Such bound states are formed by an atom and a localized photonic excitation and represent the continuum analog of the familiar dressed states in single-mode cavity QED. Here we present a detailed analysis of the linear and nonlinear spectral features associated with single- and multi-photon dressed states and show how the formation of bound states affects the waveguide-mediated dipole-dipole interactions between separated atoms. Our results provide a both qualitative and quantitative description of the essential strong-coupling processes in waveguide QED systems, which are currently being developed in the optical and the microwave regime.