Phase-stable source of polarization-entangled photons using a polarization Sagnac interferometer
arXiv:quant-ph/0509219 · doi:10.1103/PhysRevA.73.012316
Abstract
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 5 000 polarization-entangled pairs/s per 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.
Submitted to PRA
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