title: High performance fiber-coupled NbTiN superconducting nanowire single photon detectors with Gifford-McMahon cryocooler.
abstract: We present high performance fiber-coupled niobium titanium nitride superconducting nanowire single photon detectors fabricated on thermally oxidized silicon substrates. The best device showed a system detection efficiency (DE) of 74%, dark count rate of 100 c/s, and full width at half maximum timing jitter of 68 ps under a bias current of 18.0 μA with a practical Gifford-McMahon cryocooler system. We also introduced six detectors into the cryocooler and confirmed that the system DE of all detectors was higher than 67% at the dark count rate of 100 c/s.
authors.affiliation: Advanced ICT Research Institute, National Institute of Information and Communications Technology, 588-2, Iwaoka, Kobe, Hyogo 651-2492, Japan. s-miki@nict.go.jp
authors.forename: Shigehito
authors.initials: S
authors.lastname: Miki
authors.forename: Taro
authors.initials: T
authors.lastname: Yamashita
authors.forename: Hirotaka
authors.initials: H
authors.lastname: Terai
authors.forename: Zhen
authors.initials: Z
authors.lastname: Wang
mesh_terms: D003080:Cold Temperature; D004553:Electric Conductivity; D004867:Equipment Design; D019544:Equipment Failure Analysis; D005336:Fiber Optic Technology / Q000295:instrumentation*; D008422:Materials Testing; D053768:Metal Nanoparticles / Q000737:chemistry* / Q000528:radiation effects* / Q000648:ultrastructure; D053770:Nanowires / Q000737:chemistry* / Q000528:radiation effects* / Q000648:ultrastructure; D010783:Photometry / Q000295:instrumentation*