title: Highly efficient single-photon detection at communication wavelengths by use of upconversion in reverse-proton-exchanged periodically poled LiNbO3 waveguides.
abstract: Conventional single-photon detectors at communication wavelengths suffer from low quantum efficiencies and large dark counts. We present a single-photon detection system, operating at communication wavelengths, based on guided-wave frequency upconversion in a nonlinear crystal with an overall system detection efficiency (upconversion + detection) exceeding 46% at 1.56 microm. This system consists of a fiber-pigtailed reverse-proton-exchanged periodically poled LiNbO3 waveguide device in conjunction with a silicon-based single-photon counting module.
authors.affiliation: Edward L. Ginzton Laboratory, Stanford University, Stanford, California 94305-4085, USA. langrock@stanford.edu
authors.forename: Carsten
authors.initials: C
authors.lastname: Langrock
authors.forename: Eleni
authors.initials: E
authors.lastname: Diamanti
authors.forename: Rostislav V
authors.initials: RV
authors.lastname: Roussev
authors.forename: Yoshihisa
authors.initials: Y
authors.lastname: Yamamoto
authors.forename: M M
authors.initials: MM
authors.lastname: Fejer
authors.forename: Hiroki
authors.initials: H
authors.lastname: Takesue