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

Chuang Liang*, Kim Fook Lee, Milja Medic, Prem Kumar, Robert H. Hadfield, Sae Woo Nam

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

33 Scopus citations


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%.

Original languageEnglish (US)
Pages (from-to)1322-1327
Number of pages6
JournalOptics Express
Issue number3
StatePublished - Feb 5 2007

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics


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