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Author Miller, Aaron J.; Lita, Adriana E.; Calkins, Brice; Vayshenker, Igor; Gruber, Steven M.; Nam, Sae Woo openurl 
  Title Compact cryogenic self-aligning fiber-to-detector coupling with losses below one percent Type Journal Article
  Year 2011 Publication Optics Express Abbreviated Journal Opt. Express  
  Volume 19 Issue 10 Pages 9102-9110  
  Keywords TES  
  Abstract (up) We present a compact packaging technique for coupling light from a single-mode telecommunication fiber to cryogenic single-photon sensitive devices. Our single-photon detectors are superconducting transition-edge sensors (TESs) with a collection area only a factor of a few larger than the area of the fiber core which presents significant challenges to low-loss fiber-to-detector coupling. The coupling method presented here has low loss, cryogenic compatibility, easy and reproducible assembly and low component cost. The system efficiency of the packaged single-photon counting detectors is verified by the “triplet method” of power-source calibration along with the “multiple attenuator” method that produces a calibrated single-photon flux. These calibration techniques, when used in combination with through-wafer imaging and fiber back-reflection measurements, give us confidence that we have achieved coupling losses below 1 % for all devices packaged according to the self-alignment method presented in this paper.  
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  Call Number RPLAB @ gujma @ Serial 666  
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Author Elezov, M.; Ozhegov, R.; Goltsman, G.; Makarov, V. url  doi
openurl 
  Title Countermeasure against bright-light attack on superconducting nanowire single-photon detector in quantum key distribution Type Journal Article
  Year 2019 Publication Opt. Express Abbreviated Journal Opt. Express  
  Volume 27 Issue 21 Pages 30979-30988  
  Keywords SSPD, SNSPD  
  Abstract (up) We present an active anti-latching system for superconducting nanowire single-photon detectors. We experimentally test it against a bright-light attack, previously used to compromise security of quantum key distribution. Although our system detects continuous blinding, the detector is shown to be partially blindable and controllable by specially tailored sequences of bright pulses. Improvements to the countermeasure are suggested.  
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  Language English Summary Language Original Title  
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  ISSN 1094-4087 ISBN Medium  
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  Notes PMID:31684339 Approved no  
  Call Number Serial 1275  
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