The application of topology in optics has led to a new paradigm in developingphotonic devices with robust properties against disorder. Although significantprogress on topological phenomena has been achieved in the classical domain,the realization of strong light-matter coupling in the quantum domain remainsunexplored. We demonstrate a strong interface between single quantum emittersand topological photonic states. Our approach creates robustcounter-propagating edge states at the boundary of two distinct topologicalphotonic crystals. We demonstrate the chiral emission of a quantum emitter intothese modes and establish their robustness against sharp bends. This approachmay enable the development of quantum optics devices with built-in protection,with potential applications in quantum simulation and sensing.
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