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Title: High-efficiency WSi superconducting nanowire single-photon detectors operating at 2.5 K

We investigate the operation of WSi superconducting nanowire single-photon detectors (SNSPDs) at 2.5 K, a temperature which is ∼70% of the superconducting transition temperature (T{sub C}) of 3.4 K. We demonstrate saturation of the system detection efficiency at 78 ± 2% at a wavelength of 1310 nm, with a jitter of 191 ps. We find that the jitter at 2.5 K is limited by the noise of the readout and can be improved through the use of cryogenic amplifiers. Operation of SNSPDs with high efficiency at temperatures very close to T{sub C} appears to be a unique property of amorphous WSi.
Authors:
; ; ; ;  [1] ; ; ;  [2] ; ;  [3]
  1. National Institute of Standards and Technology, 325 Broadway, Boulder, Colorado 80305 (United States)
  2. Group of Applied Physics, University of Geneva, CH-1211 Geneva 4 (Switzerland)
  3. Jet Propulsion Laboratory, California Institute of Technology, 4800 Oak Grove Dr., Pasadena, California 91109 (United States)
Publication Date:
OSTI Identifier:
22350756
Resource Type:
Journal Article
Resource Relation:
Journal Name: Applied Physics Letters; Journal Volume: 105; Journal Issue: 12; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY; 77 NANOSCIENCE AND NANOTECHNOLOGY; AMORPHOUS STATE; DETECTION; EFFICIENCY; NANOWIRES; PHOTODETECTORS; PHOTONS; READOUT SYSTEMS; SATURATION; SUPERCONDUCTING DEVICES; TEMPERATURE RANGE 0000-0013 K; TRANSITION TEMPERATURE; TUNGSTEN SILICIDES; WAVELENGTHS