Iii-V Photonic Integrated Circuit With Waveguide-Coupled Light-Emitting Diodes And Wsi Superconducting Single-Photon Detectors

We demonstrate cryogenic, all on-chip, single-photon-level photonic integrated circuits on a III-V platform with waveguide-coupled quantum-well sources and tungsten silicide superconducting nanowire single-photon detectors. We have measured the dark count rates below 10(-3)counts/s and have reduced the cross talk to an adjacent waveguide by 30dB.