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We address the intrinsic multimode nature of the quantum state of lightobtained by pulsed spontaneous parametric downconversion and develop atheoretical model based only on experimentally accessible quantities. Weexploit the pairwise entanglement as a resource for conditional multimodemeasurements and derive closed formulas for the detection probability and thedensity matrix of the conditional states. We present a set of experimentsperformed to validate our model in different conditions that are in excellentagreement with experimental data. Finally, we evaluate nonGaussianity of theconditional states obtained from our source with the aim of discussing theeffects of the different experimental parameters on the efficacy of this typeof conditional state preparation.

Conditional measurements on multimode pairwise entangled states from spontaneous parametric downconversion