Ultrabright source of polarization-entangled photons

Journal Article · Sun Aug 01 04:00:00 EDT 1999 · Physical Review A

DOI:https://doi.org/10.1103/PhysRevA.60.R773· OSTI ID:357295

Kwiat, P G; Waks, E; White, A G; Appelbaum, I ^[1]; Eberhard, P H ^[2]

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1. Physics Division, P-23, Los Alamos National Laboratory, Los Alamos, New Mexico 87545 (United States)
2. Lawrence Berkeley Laboratory, University of California at Berkeley, Berkeley, California 94720 (United States)

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-{sigma} violation of Bell{close_quote}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. {copyright} {ital 1999} {ital The American Physical Society}

• OSTI ID: 357295
• Journal Information: Physical Review A, Journal Name: Physical Review A Journal Issue: 2 Vol. 60; ISSN 1050-2947; ISSN PLRAAN
• Country of Publication: United States
• Language: English

Related Subjects

66 PHYSICS
BELL THEOREM
LIGHT SOURCES
OPTICAL PUMPING
POLARIZATION
QUANTUM MECHANICS