All-fiber photon-pair source for quantum communications: Improved generation of correlated photons

Xiaoying Li*, Jun Chen, Paul Voss, Jay Sharping, Prem Kumar

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

181 Scopus citations


We demonstrate greatly improved results for the production of correlated photon-pairs using the four-photon scattering process in silica fiber. We achieve a true-coincidence-count to accidental-coincidence-count ratio greater than 10, when the photon-pair production rate is about 0.04/pulse. This represents a four-fold improvement over our previous results. The contribution of spontaneous Raman scattering, the primary cause of uncorrelated photons that degrades the fidelity of this source, is reduced by decreasing the wavelength detuning between the correlated photons and the pump photons and by using polarizers to remove the cross-polarized Raman-scattered photons. Excess Raman scattering could be further suppressed by cooling the silica fiber. Even without cooling the fiber, the achieved 10 to 1 ratio of true-coincidence to accidental-coincidence makes the fiber source of correlated photon-pairs a useful tool for realizing various quantum-communication protocols.

Original languageEnglish (US)
Pages (from-to)3737-3744
Number of pages8
JournalOptics Express
Issue number16
StatePublished - Aug 2004

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics


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