Abstract
We report the observation of correlated photon pairs generated by spontaneous
parametric downconversion of a 400-nm pump pulse in a quasi-phase-matched nonlinear waveguide. The highest ratio of coincidence to single-photon
count rates observed near 800 nm exceeds 18%. This suggests
that nonlinear waveguides will be a promising source of correlated photons
for metrology and quantum information processing applications. We also discuss
possibilities of controlling the spatial characteristics of the downconverted
photons produced in multimode waveguide structures.
© 2001 Optical Society of America
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