Demonstrating quantum properties of triple photons generated by processes Kamel Bencheikh, Marina F. B. Cenni, Enky Oudot, Véronique Boutou, Corinne Félix, Joel Compte Prades, Augustin Vernay, Julien Bertrand, Florent Bassignot, Mathieu Chauvet et al. (4 more) Eur. Phys. J. D, 76 10 (2022) 186 Published online: 10 October 2022 DOI: 10.1140/epjd/s10053-022-00514-3