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Deterministic GHz-rate single photon sources at room-temperature would beessential components for various quantum applications. However, both the slowintrinsic decay rate and the omnidirectional emission of typical quantumemitters are two obstacles towards achieving such a goal which are hard toovercome simultaneously. Here we solve this challenge by a hybrid approach,using a complex monolithic photonic resonator constructed of a gold nanoconeresponsible for the rate enhancement, and a circular Bragg antenna for emissiondirectionality. A repeatable process accurately binds quantum dots to the tipof the antenna-embedded nanocone. As a result we achieve simultaneous 20-foldemission rate enhancement and record-high directionality leading to an increasein the observed brightness by a factor as large as 580 (120) into an NA = 0.22(0.5). We project that such miniaturized on-chip devices can reach photon ratesapproaching 2.3*10^8 single photons/second thus enabling ultra-fastlight-matter interfaces for quantum technologies at ambient conditions.

Overcoming the rate-directionality tradeoff: a room-temperature ultrabright quantum light source