Physics – Quantum Physics
Scientific paper
2001-06-21
Physics
Quantum Physics
8 pages 8 figures
Scientific paper
10.1103/PhysRevA.65.063805
A new ultra bright pulsed source of polarization entangled photons has been realized using type-II phase matching in spontaneous parametric down conversion process in two cascaded crystals. The optical axes of the crystals are aligned in such a way that the extraordinarily (ordinarily) polarized cone from one crystal overlaps with the ordinarily (extraordinarily) polarized cone from the second crystal. This spatial overlapping removes the association between the polarization and the output angle of the photons that exist in a single type-II down conversion process. Hence, entanglement of photons originating from any point on the output cones is possible if a suitable optical delay line is used. This delay line is particularly simple and easy to implement.
Bitton G.
Grice Warren P.
Moreau John
Zhang Lianchang
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