Conditional measurements on multimode pairwise entangled states from spontaneous parametric downconversionA. Allevi, A. Andreoni, F. A. Beduini, M. Bondani, M. G. Genoni, S. Olivares and M. G. A. ParisEPL, 92 2 (2010) 20007DOI: https://doi.org/10.1209/0295-5075/92/20007