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Observation and Manipulation of Optical Parametric Down-Conversion in the Langevin Regime
Yen-Ju Chen, Chun-Yuan Cheng, Tien-Dat Pham, Tzu-An Chen, Chang-Hau Kuo, Yen-Hung Chen, Chih-Sung Chuu·November 13, 2025·DOI: 10.1103/mcxn-x7bz
Quantum Physics
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Abstract
Quantum fluctuation plays a key role in the parametric down-conversion in the Langevin regime. In this paper, we report the experimental realization of optical parametric down-conversion in the Langevin regime on a chip. By precisely controlling the loss inherently tied to fluctuation, we observe the asymmetric Hong-Ou-Mandel dip - a hallmark of quantum fluctuation in the fluctuation-driven PDC, and the fluctuation-induced compression of single photons by nearly one order of magnitude. These findings pave the way for the manipulation of quantum fluctuation, quantum states, and system-reservoir interaction.