Deterministic single-photon source in the ultrastrong-coupling regimeRemoveJie Peng, Jianing Tang, Pinghua Tang, Zhongzhou Ren, Junlong Tian, Nancy Barraza, Gabriel Alvarado Barrios, Lucas Lamata, Enrique Solano, and F. Albarrán-ArriagadaPhys. Rev. A 108, L031701 (2023)