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SQUID-Readout for the Superconducting Nanowire Single-Photon Detector

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8 Author(s)
Kirste, A. ; Phys.- Tech. Bundesanstalt (PTB), Berlin, Germany ; Semenov, A. ; Hubers, H.-W. ; Drung, D.
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Superconducting single-photon detectors from thin niobium nitride nanostrips exhibit a near-infrared cut-off of the wavelength-independent quantum efficiency along with a moderate energy resolution in the wavelength range around the cut-off. For the wavelength range before the cut-off, we have developed the electro-thermal model that describes the initial growth, diminution and disappearance of the normal domain created by a photon in the superconducting nanostrip. The response parameters extracted from the model fit were used to optimize the signal-to-noise ratio of the SQUID-based readout and to achieve in the temperature range from 1 to 4 K a photon counting frequency of 20 MHz and a dark count rate less than four in one hour.

Published in:

Applied Superconductivity, IEEE Transactions on  (Volume:19 ,  Issue: 3 )