Topological quantum optics using atom-like emitter arrays coupled to photonic crystals

TL;DR

This paper introduces a nanophotonic platform with quantum emitter arrays in photonic crystals to realize topological quantum optics, enabling robust edge states and potential exploration of topological many-body states.

Contribution

It proposes a novel system of quantum emitters in photonic crystals that exhibits topological band gaps and protected edge states, advancing topological quantum optics research.

Findings

Large topological band gaps achieved

Almost flat topological bands observed

Edge states protected against imperfections

Abstract

We propose a nanophotonic platform for topological quantum optics. Our system is composed of a two-dimensional lattice of non-linear quantum emitters with optical transitions embedded in a photonic crystal slab. The emitters interact through the guided modes of the photonic crystal, and a uniform magnetic field gives rise to large topological band gaps and an almost completely flat topological band. Topological edge states arise on the boundaries of the system that are protected by the large gap against missing lattice sites and to the inhomogeneous broadening of emitters. These results pave the way for exploring topological many-body states in quantum optical systems.