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Spectral Sensitivity of the NbN Single-Photon Superconducting Detector
Roman SOBOLEWSKI Ying XU Xuemei ZHENG Carlo WILLIAMS Jin ZHANG Aleksandr VEREVKIN Galina CHULKOVA Alexander KORNEEV Andrey LIPATOV Oleg OKUNEV Konstantin SMIRNOV Gregory N. GOL'TSMAN
IEICE TRANSACTIONS on Electronics
Publication Date: 2002/03/01
Print ISSN: 0916-8516
Type of Manuscript: Special Section INVITED PAPER (Special Issue on Superconductive Electronics)
Category: Novel Devices and Device Physics
single-photon optical detector, quantum efficiency, infrared radiation, NbN superconducting thin film, quantum communication, spectral sensitivity,
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We report our studies on the spectral sensitivity of superconducting NbN thin-film single-photon detectors (SPD's) capable of GHz counting rates of visible and near-infrared photons. In particular, it has been shown that a NbN SPD is sensitive to 1.55-µm wavelength radiation and can be used for quantum communication. Our SPD's exhibit experimentally measured intrinsic quantum efficiencies from 20% at 800 nm up to 1% at 1.55-µm wavelength. The devices demonstrate picosecond response time (<100 ps, limited by our readout system) and negligibly low dark counts. Spectral dependencies of photon counting of continuous-wave, 0.4-µm to 3.5-µm radiation, and 0.63-µm, 1.33-µm, and 1.55-µm laser-pulsed radiations are presented for the single-stripe-type and meander-type devices.