Nature CommunicationsStrong coupling between a single-photon and a two-photon Fock stateShuai-Peng WangAlberto MercurioAlessandro RidolfoYuqing WangMo ChenWenyan WangYulong LiuHuanying SunTiefu LiFranco NoriSalvatore SavastaJ. Q. You2025-09-30Full textDOI https://doi.org/10.1038/s41467-025-63783-7