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We experimentally investigate the mode characteristics of multimode radiationfields propagating through frequency dependent Gaussian channels. Aftermanipulating the twin beams emitted from a conventional parametricdown-conversion source via spectral filtering, we study the changes in theirmode characteristics, utilizing the joint normalized correlation functions.While filtering reduces the number of spectral modes, it also leads to anapparent mode mismatch, which destroys the perfect photon-number correlationbetween the twin beams, and influences the mode properties of heralded states.

Testing spectral filters as Gaussian quantum optical channels