Nature CommunicationsCounter-propagating entangled photon pairs from monolayer GaSeZhuoyuan LuJiri JanousekSyed M. AssadShuyao QiuMayank JoshiYecheng HuAlex Y. SongChuanyu WangManuka SuriyageJie ZhaoPing Koy LamYuerui Lu2025-10-30Full textDOI https://doi.org/10.1038/s41467-025-64620-7