Yoshiaki Tsujimoto, Kentaro Wakui, Tadashi Kishimoto, Shigehito Miki, Masahiro Yabuno, Hirotaka Terai, Mikio Fujiwara, Go Kato. "Experimental entanglement swapping through single-photon χ(2) nonlinearity." Nature Communications, 2025. doi:10.1038/s41467-025-63785-5