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Ultrabright source of polarization-entangled photons Paul G. Kwiat,1

Summary: Ultrabright source of polarization-entangled photons
Paul G. Kwiat,1
Edo Waks,1,
* Andrew G. White,1
Ian Appelbaum,1,
and Philippe H. Eberhard2
Physics Division, P-23, Los Alamos National Laboratory, Los Alamos, New Mexico 87545
Lawrence Berkeley Laboratory, University of California at Berkeley, Berkeley, California 94720
Received 2 October 1998
Using the process of spontaneous parametric down-conversion in a two-crystal geometry, we have generated
a source of polarization-entangled photon pairs that is more than ten times brighter, per unit of pump power,
than previous sources, with another factor of 30 to 75 expected to be readily achievable. We have measured a
high level of entanglement between photons emitted over a relatively large collection angle, and over a 10-nm
bandwidth. As a demonstration of the source capabilities, we obtained a 242- violation of Bell's inequalities
in less than three minutes, and observed near-perfect photon correlations when the collection efficiency was
reduced. In addition, both the degree of entanglement and the state purity should be readily tunable.
S1050-2947 99 50108-X
PACS number s : 42.50.Dv, 03.65.Bz, 03.67. a


Source: Appelbaum, Ian - Department of Physics, University of Maryland at College Park
Kwiat, Paul - Department of Physics, University of Illinois at Urbana-Champaign
White, Andrew G. - Department of Physics, University of Queensland


Collections: Engineering; Materials Science; Physics