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Title: The effect of magnetic field on the intrinsic detection efficiency of superconducting single-photon detectors

We experimentally investigate the effect of a magnetic field on photon detection in superconducting single-photon detectors (SSPDs). At low fields, the effect of a magnetic field is through the direct modification of the quasiparticle density of states of the superconductor, and magnetic field and bias current are interchangeable, as is expected for homogeneous dirty-limit superconductors. At the field where a first vortex enters the detector, the effect of the magnetic field is reduced, up until the point where the critical current of the detector starts to be determined by flux flow. From this field on, increasing the magnetic field does not alter the detection of photons anymore, whereas it does still change the rate of dark counts. This result points at an intrinsic difference in dark and photon counts, and also shows that no enhancement of the intrinsic detection efficiency of a straight SSPD wire is achievable in a magnetic field.
Authors:
; ; ; ; ; ; ;  [1] ; ; ; ;  [2] ;  [2] ;  [3] ;  [4] ;  [5]
  1. Huygens-Kamerlingh Onnes Lab, Leiden University, Niels Bohrweg 2, 2333 CA Leiden (Netherlands)
  2. COBRA Research Institute, Eindhoven University of Technology, P.O. Box 513, 5600 MB Eindhoven (Netherlands)
  3. (United Kingdom)
  4. Univ. Grenoble Alpes, INAC-SPSMS, 38000 Grenoble (France)
  5. (France)
Publication Date:
OSTI Identifier:
22412761
Resource Type:
Journal Article
Resource Relation:
Journal Name: Applied Physics Letters; Journal Volume: 106; Journal Issue: 9; Other Information: (c) 2015 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; CRITICAL CURRENT; DENSITY OF STATES; EFFICIENCY; MAGNETIC FIELDS; MODIFICATIONS; PHOTODETECTORS; PHOTONS; SUPERCONDUCTING DEVICES; SUPERCONDUCTORS; VORTICES