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

TL;DR

This paper demonstrates a hybrid integrated quantum-dot single-photon source on silicon that achieves efficient unidirectional photon output, advancing scalable quantum photonics integration.

Contribution

It introduces a novel hybrid integration method with a photonic crystal mirror for unidirectional photon emission on silicon photonics.

Findings

Successful demonstration of single-photon generation from a quantum dot

Efficient unidirectional photon output achieved

Hybrid integration maintained high efficiency despite stacking misalignment

Abstract

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