Abstract
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.
- Received 5 July 1995
DOI:https://doi.org/10.1103/PhysRevLett.75.4337
©1995 American Physical Society
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The Physical Review Journals Celebrate The International Year of Light
The editors of the Physical Review journals revisit papers that represent important breakthroughs in the field of optics.
