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Characterization of fiber-generated entangled photon pairs with superconducting single-photon detectors

Published

Author(s)

Chuang Liang, Fook L. Kim, Milja Medic, Prem Kumar, Robert Hadfield, Sae Woo Nam

Abstract

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 %.
Citation
Optics Express
Volume
15
Issue
3

Keywords

entanglement, NbN, photon, quantum information, single photon detector, SSPD, superconductor

Citation

Liang, C. , Kim, F. , Medic, M. , Kumar, P. , Hadfield, R. and Nam, S. (2007), Characterization of fiber-generated entangled photon pairs with superconducting single-photon detectors, Optics Express, [online], https://tsapps.nist.gov/publication/get_pdf.cfm?pub_id=32498 (Accessed April 16, 2024)
Created February 4, 2007, Updated October 12, 2021