Constriction-limited detection efficiency of superconducting nanowire single-photon detectors

  title={Constriction-limited detection efficiency of superconducting nanowire single-photon detectors},
  author={Andrew J. Kerman and Eric A. Dauler and Joel K. W. Yang and Kristine M. Rosfjord and Vikas Anant and Karl K. Berggren and Gregory N. Gol'tsman and Boris M. Voronov},
  journal={Applied Physics Letters},
We investigate the source of the large variations in the observed detection efficiencies of superconducting nanowire single-photon detectors between many nominally identical devices. Through both electrical and optical measurements, we infer that these variations arise from “constrictions:” highly localized regions of the nanowires where the effective cross-sectional area for superconducting current is reduced. These constrictions limit the bias-current density to well below its critical value… 

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