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Integrated photonic circuits provide a versatile toolbox of functionalitiesfor advanced quantum optics applications. Here, we demonstrate an essentialcomponent of such a system in the form of a Purcell enhanced single-photonsource based on a quantum dot coupled to a robust on-chip integrated resonator.For that, we develop GaAs monolithic ring cavities based on distributed Braggreflector ridge waveguides. Under resonant excitation conditions, we observe anover twofold spontaneous emission rate enhancement using Purcell effect andgain a full coherent optical control of a QD-two-level system via Rabioscillations. Furthermore, we demonstrate an on-demand single-photon generationwith strongly suppressed multi-photon emission probability as low as 1% andtwo-photon interference with visibility up to 95%. This integratedsingle-photon source can be readily scaled up, promising a realistic pathwayfor scalable on-chip linear optical quantum simulation, quantum computation andquantum networks.

Purcell enhanced and indistinguishable single-photon generation from quantum dots coupled to on-chip integrated ring resonators