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arXiv · 2602.05491

Quantum dot single photon source on SiN integrated with coupled crossover waveguides

Akinari Fujita·Hironobu Yoshimi·Natthajuks Pholsen·Masahiro Kakuda·Makoto Okano·Satoshi Iwamoto·Yasuhiko Arakawa·Yasutomo Ota
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Abstract

Hybrid integration of InAs/GaAs quantum dot (QD) single-photon sources (SPSs) is a promising approach for introducing quantum light into SiN photonic integrated circuits. However, the large refractive-index mismatch between GaAs and SiN poses a challenge for efficient optical coupling. Here, we propose and experimentally demonstrate hybrid integration of an InAs/GaAs QD-SPS on SiN using a coupled crossover waveguide structure. A photonic crystal nanocavity is employed for coupling QD emission into a GaAs waveguide, which efficiently transfers photons to a SiN waveguide at the crossover section. We observed Purcell-enhanced single-photon emission, on-chip propagation, and outcoupling through a SiN grating coupler.

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Akinari Fujita, Hironobu Yoshimi, Natthajuks Pholsen, Masahiro Kakuda, Makoto Okano, Satoshi Iwamoto, Yasuhiko Arakawa, Yasutomo Ota. 2026-02-05. Quantum dot single photon source on SiN integrated with coupled crossover waveguides. https://doi.org/10.35848/1882-0786%2Fae4169

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