Spatial distinguishability of photons produced by spontaneous parametric down-conversion with a focused pump

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Ryan S. Bennink, Yun Liu, D. Duncan Earl, and Warren P. Grice
Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA

Received 13 February 2006; published 3 August 2006

Itis known that photons produced by spontaneous parametric down-conversion canbe coupled into optical fibers more efficiently by focusing thepump field. We find that focusing the pump in type-IIdown-conversion causes photons of ordinary and extraordinary polarization to acquirevery different angular spreads, which amounts to spatial information thatdistinguishes between the polarization states. Numerical studies predict that thephotons collected by a detector or quantum channel will beof predominantly one polarization and that the degree of polarizationentanglement will be lessened in some cases.

URL:	http://link.aps.org/doi/10.1103/PhysRevA.74.023802
DOI:	10.1103/PhysRevA.74.023802
PACS:	42.65.Lm; 42.50.Dv; 03.67.Mn 42.65.Lm Optical parametric down conversion and production of entangled photons 42.50.Dv Nonclassical states of the electromagnetic field, including entangled photon states; quantum state engineering and measurements 03.67.Mn Quantum entanglement production, characterization, and manipulation YEAR: 2006
KEYWORDS:	optical frequency conversion, optical focusing, optical fibre polarisation, quantum entanglement

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