Quantum photonic integration circuits are a promising approach to scalable quantum processing with photons. Waveguide single-photon-detectors (WSPDs) based on superconducting nanowires have been recently shown to be compatible with single-photon sources for a monolithic integration. While standard WSPDs offer single-photon sensitivity, more complex superconducting nanowire structures can be configured to have photon-number-resolving capability. In this work, we present waveguide photon-number-resolving detectors (WPNRDs) on GaAs/Al0.75Ga0.25As ridge waveguides based on a series connection of nanowires. The detection of 0-4 photons has been demonstrated with a four-wire WPNRD, having a single electrical read-out. A device quantum efficiency ~24 % is reported at 1310 nm for the TE polarization.
@article{arxiv.1308.4606,
title = {Waveguide photon-number-resolving detectors for quantum photonic integrated circuits},
author = {D. Sahin and A. Gaggero and Z. Zhou and S. Jahanmirinejad and F. Mattioli and R. Leoni and J. Beetz and M. Lermer and M. Kamp and S. Höfling and A. Fiore},
journal= {arXiv preprint arXiv:1308.4606},
year = {2015}
}