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Advanced Photonics

Poled-Fiber Source of Polarization-Entangled Photon Pairs

E. Y. Zhu, Zhenzhou Tang, Li Qian, L. G. Helt, Marco Liscidini, John E. Sipe, Costantino Corbari, Albert Canagasabey, Morten Ibsen, Peter G. Kazansky

Published Jan 1, 2011• 1 citation
Publisher

Abstract

We demonstrate broadband telecom-wavelength polarization-entangled photon pair generation in a periodically-poled silica fiber (PPSF). Two-photon interference visibility exceeds 90%, and Bell’s inequality is violated by 8 standard deviations.
DOI
10.1364/sof.2011.sowe2

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In this Letter, we report a polarization-entangled photon-pair source based on type-II spontaneous parametric downconversion at telecom O-band in periodically poled silica fiber (PPSF). The photon-pair source exhibits more than 130 nm ( ∼ 24 T H z ) emission bandwidth centered at 1306.6 nm. The broad emission spectrum results in a short biphoton correlation time, and we experimentally demonstrate a Hong–Ou–Mandel interference dip with a full width of 26.6 fs at half-maximum. Owing to the low birefringence of the PPSF, the biphotons generated from type-II SPDC are polarization-entangled over the entire emission bandwidth, with a measured fidelity to a maximally entangled state greater than 95.4%. The biphoton source provides the broadest bandwidth entangled biphotons at O-band to our knowledge.