Journal
OPTICS EXPRESS
Volume 13, Issue 1, Pages 127-135Publisher
OPTICAL SOC AMER
DOI: 10.1364/OPEX.13.000127
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We present a simple polarization entanglemenet source based on type-II phase-matched parametric down-conversion in periodically poled KTiOPO4. By use of noncritical phase matching in a noncollinear geometry the single-crystal source emits a cone of polarization-entangled photons. Two beams on opposite sides of the cone are selected for measurements to yield an observed flux of 820 pairs/s per mW of pump power with a two-photon fringe visibility of 96%. With this source we measure a violation of Bell's inequality of 140 standard deviations in 160 s. (C) 2005 Optical Society of America.
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