Ultra-bright source of polarization-entangled photons

Details Ultra-bright source of polarization-entangled photons Ultra-bright source of polarization-entangled photons

1998-10-02

arxiv.org/abs/quant-ph/9810003v3

Physical Review A 60, 773-776 (1999)

Physics

Quantum Physics

4 pages, 5 encapsulated Postscript figures. To appear in Physical Review A (Rapid Communication)

Scientific paper

10.1103/PhysRevA.60.R773

Using the process of spontaneous parametric down conversion in a novel two-crystal geometry, one can generate a source of polarization-entangled photon pairs which is orders of magnitude brighter than previous sources. 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 intensity, we obtained a 242-$\sigma$ violation of Bell's inequalities in less than three minutes.

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