Probing the hotspot interaction length in NbN nanowire superconducting single photon detectors

We measure the maximal distance at which two absorbed photons can jointly trigger a detection event in NbN nanowire superconducting single photon detector microbridges by comparing the one-photon and two-photon efficiencies of bridges of different overall lengths, from 0 to 400 nm. We find a length...

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Published in:Applied physics letters 2017-06, Vol.110 (23)
Main Authors: Renema, J. J., Gaudio, R., Wang, Q., Gaggero, A., Mattioli, F., Leoni, R., van Exter, M. P., Fiore, A., de Dood, M. J. A.
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Language:English
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Applied physics
Nanowires
Niobium nitride
Photons
Quantum theory
Superconductivity
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container_issue 23
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container_title Applied physics letters
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creator Renema, J. J.
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description We measure the maximal distance at which two absorbed photons can jointly trigger a detection event in NbN nanowire superconducting single photon detector microbridges by comparing the one-photon and two-photon efficiencies of bridges of different overall lengths, from 0 to 400 nm. We find a length of 23 ± 2 nm. This value is in good agreement with the size of the quasiparticle cloud at the time of the detection event.
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subjects Applied physics
Nanowires
Niobium nitride
Photons
Quantum theory
Superconductivity
title Probing the hotspot interaction length in NbN nanowire superconducting single photon detectors
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