Abstract
We report the observation of beatings of the coincidence event rate in a Hong–Ou–Mandel interference (HOMI) between signal and idler photons from a parametric downconversion (PDC) process inside a multimode KTP waveguide. As an explanation we introduce biphotonic states entangled in their broadband frequency modes generated by waveguide mode triples and propose a suitable entanglement detection scheme.
© 2008 Optical Society of America
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