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Superconducting Photon Number Resolving Counter For Near Infrared Applications

A Korneev,A Divochiy,Francesco Marsili,David Bitauld,Andrea Fiore,V Seleznev,N Kaurova,M Tarkhov,O Minaeva,G Chulkova,K Smirnov,A Gaggero,R Leoni,F Mattioli,Konstantinos G Lagoudakis,Moushab Benkhaoul, F Levy,G N Goltsman

PHOTONICS, DEVICES, AND SYSTEMS IV（2008）

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Abstract
We present a novel concept of photon number resolving detector based on 120-nm-wide superconducting stripes made of 4-nm-thick NbN film and connected in parallel (PNR-SSPD). The detector consisting of 5 strips demonstrate a capability to resolve up to 4 photons absorbed simultaneously with the single-photon quantum efficiency of 2.5% and negligibly low dark count rate.
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Nanowire superconducting single-photon detector, ultrathin NbN film, infrared
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