%0 Journal Article
%T Photon-number resolving detector based on a series array of superconducting nanowires
%A Saeedeh Jahanmirinejad
%A Giulia Frucci
%A Francesco Mattioli
%A Dondu Sahin
%A Alessandro Gaggero
%A Roberto Leoni
%A Andrea Fiore
%J Physics
%D 2012
%I arXiv
%R 10.1063/1.4746248
%X We present the experimental demonstration of a superconducting photon number resolving detector. It is based on the series connection of N superconducting nanowires, each connected in parallel to an integrated resistor. The device provides a single voltage readout, proportional to the number of photons absorbed in distinct nanowires. Clearly separated output levels corresponding to the detection of n=1-4 photons are observed in a 4-element detector fabricated from an NbN film on GaAs substrate, with a single-photon system quantum efficiency of 2.6% at the wavelength of 1300nm. The series-nanowire structure is promising in view of its scalability to large photon numbers and high efficiencies.
%U http://arxiv.org/abs/1203.5477v1