title: Quantum detector tomography of a time-multiplexed superconducting nanowire single-photon detector at telecom wavelengths.
abstract: Superconducting nanowire single-photon detectors (SNSPDs) are widely used in telecom wavelength optical quantum information science applications. Quantum detector tomography allows the positive-operator-valued measure (POVM) of a single-photon detector to be determined. We use an all-fiber telecom wavelength detector tomography test bed to measure detector characteristics with respect to photon flux and polarization, and hence determine the POVM. We study the SNSPD both as a binary detector and in an 8-bin, fiber based, Time-Multiplexed (TM) configuration at repetition rates up to 4 MHz. The corresponding POVMs provide an accurate picture of the photon number resolving capability of the TM-SNSPD.
authors: School of Engineering and Physical Sciences, Heriot-Watt University, Edinburgh, UK. cmn@stanford.edu
authors: Chandra M
authors: CM
authors: Natarajan
authors: Lijian
authors: L
authors: Zhang
authors: Hendrik
authors: H
authors: Coldenstrodt-Ronge
authors: Gaia
authors: G
authors: Donati
authors: Sander N
authors: SN
authors: Dorenbos
authors: Val
authors: V
authors: Zwiller
authors: Ian A
authors: IA
authors: Walmsley
authors: Robert H
authors: RH
authors: Hadfield