Phys. Rev. A 73, 012316 (2006) [5 pages]Phase-stable source of polarization-entangled photons using a polarization Sagnac interferometerReceived 29 September 2005; published 11 January 2006 We demonstrate a simple, robust, and ultrabright parametric down-conversion source of polarization-entangled photons based on a polarization Sagnac interferometer. Bidirectional pumping in type-II phase-matched periodically poled KTiOPO4 yields a measured flux of 5000 polarization-entangled pairs/s/mW of pump power in a 1-nm bandwidth at 96.8% quantum-interference visibility. The common-path arrangement of the Sagnac interferometer eliminates the need for phase stabilization for the biphoton output state. © 2006 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevA.73.012316
DOI:
10.1103/PhysRevA.73.012316
PACS:
03.67.Mn, 03.65.Ud, 42.65.Lm, 42.50.Dv
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