Hong-Ou-Mandel characterization of multiply charged Levitons Dario Ferraro, Flavio Ronetti, Luca Vannucci, Matteo Acciai, Jérôme Rech, Thibaut Jockheere, Thierry Martin and Maura Sassetti Eur. Phys. J. Special Topics, 227 12 (2018) 1345-1359 Published online: 18 October 2018 DOI: 10.1140/epjst/e2018-800074-1