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Phys. Rev. Lett. 75, 4337 - 4341 (1995)

New High-Intensity Source of Polarization-Entangled Photon Pairs

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Paul G. Kwiat *, Klaus Mattle, Harald Weinfurter, and Anton Zeilinger
Institut für Experimentalphysik, Universität Innsbruck, Technikerstrasse 25, 6020 Innsbruck, Austria

Alexander V. Sergienko and Yanhua Shih
Department of Physics, University of Maryland Baltimore County, Baltimore, Maryland 21228

Received 5 July 1995

We report on a high-intensity source of polarization-entangled photon pairs with high momentum definition. Type-II noncollinear phase matching in parametric down conversion produces true entanglement: No part of the wave function must be discarded, in contrast to previous schemes. With two-photon fringe visibilities in excess of 97%, we demonstrated a violation of Bell's inequality by over 100 standard deviations in less than 5 min. The new source allowed ready preparation of all four of the EPR-Bell states.


©1995 The American Physical Society

URL: http://link.aps.org/doi/10.1103/PhysRevLett.75.4337
DOI: 10.1103/PhysRevLett.75.4337
PACS: 03.65.Bz, 42.50.Dv

* Current address: Physics Div., MS-H803, Los Alamos National Laboratory, Los Alamos, NM 87545.

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