Quantum detector tomography of a time-multiplexed superconducting nanowire single-photon detector at telecom wavelengths

Chandra M Natarajan, Lijian Zhang, Hendrik Coldenstrodt-Ronge, Gaia Donati, Sander N. Dorenbos, Val Zwiller, Ian A. Walmsley, Robert H Hadfield

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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. (C) 2013 Optical Society of America

Original languageEnglish
Pages (from-to)893-902
Number of pages10
JournalOptics Express
Issue number1
Publication statusPublished - 14 Jan 2013



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