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Frontiers in Optics

Joint Characterization of Two Single Photon Detectors with a Fiber-based Source of Entangled Photon Pairs

Daniel E. Jones, Brian T. Kirby, Michael Brodsky

Published Jan 1, 2017• 6 citations
Publisher

Abstract

By simultaneously measuring individual and coincidence counts of two single photon detectors connected to an entangled photon pair source, we extract the detector efficiencies, the average number of generated pairs, and the Raman noise floor.
DOI
10.1364/fio.2017.jw4a.37

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We demonstrate the suitability of fiber-generated entangled photon pairs for practical quantum communications in the telecom band by measuring their properties with superconducting single-photon detectors that produce negligible dark counts. The photon pairs are created in approximately 5-ps duration windows at 50 MHz rate while the detectors are operated in ungated free running mode. We obtain a coincidence to accidental-coincidence ratio >80 with raw photon-counting data, i.e., without making any post-measurement corrections. Using a previously demonstrated counter-propagating scheme we also produce polarization-entangled photon pairs at 50-MHz rate, which in coincidence detection directly yield two-photon interference with a fringe visibility >98%.
By simultaneously measuring individual and coincidence counts of two single photon detectors connected to a fiber-based entangled photon source and fitting the results with a theoretical model of the photon generation rates, we determine the average number of polarization-entangled photon pairs generated by four-wave mixing and the average number of noise photons generated by Raman scattering and self-phase modulation of the pump as a function of power. In contrast to previous efforts to characterize fiber-based entangled photon sources, this method does not require additional coherence-based measurements to distinguish SPM photons from FWM and Raman-scattered photons.