Observation and Manipulation of Optical Parametric Downconversion in the Langevin RegimeRemoveYen-Ju Chen, Chun-Yuan Cheng, Tien-Dat Pham, Tzu-An Chen, Chang-Hau Kuo, Yen-Hung Chen, and Chih-Sung ChuuPhys. Rev. Lett. 135, 203601 (2025)