Nigro, DavideClementi, MarcoBres, Camille-SophieLiscidini, MarcoGerace, Dario2022-12-192022-12-192022-12-192022-10-1510.1364/OL.468546https://infoscience.epfl.ch/handle/20.500.14299/193309WOS:000892110400003Achieving the regime of single-photon nonlinearities in photonic devices by just exploiting the intrinsic high-order susceptibilities of conventional materials would open the door to practical semiconductor-based quantum photonic technologies. Here we show that this regime can be achieved in a triply resonant integrated photonic device made of two coupled ring resonators, in a material platform displaying an intrinsic third-order nonlinearity. By strongly driving one of the three resonances of the system, a weak coherent probe at one of the others results in a strongly suppressed two-photon probability at the output, evidenced by an antibunched second-order correlation function at zerotime delay under continuous wave driving. (C) 2022 Optica Publishing Group.Opticsparametric oscillationchipgenerationcavitylighttext::journal::journal article::research article