Photon-number-resolving detector with10bitsof resolution

Abstract

A photon-number-resolving detector with single-photon resolution is described and demonstrated. It has $10\mathrm{bits}$ of resolution, does not require cryogenic cooling, and is sensitive to near ir wavelengths. This performance is achieved by flood illuminating a $32\times 32$ element ${\mathrm{In}}_x{\mathrm{Ga}}_{1-x}\mathrm{AsP}$ Geiger-mode avalanche photodiode array that has an integrated counter and digital readout circuit behind each pixel.