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We report a quantum-dot single-photon source (QD SPS) hybrid integrated on asilicon waveguide embedding a photonic crystal mirror, which reflects photonsand enables efficient unidirectional output from the waveguide. The siliconwaveguide is constituted of a subwavelength grating so as to maintain the highefficiency even under the presence of stacking misalignment accompanied byhybrid integration processes. Experimentally, we assembled the hybrid photonicstructure by transfer printing, and demonstrated single-photon generation froma QD and its unidirectional output from the waveguide. These results point outa promising approach toward scalable integration of SPSs on silicon quantumphotonics platforms.

Unidirectional output from a quantum-dot single-photon source hybrid integrated on silicon