2025/01/15 by Denis A. Kopylov, Michael Stefszky, Kopylov, Denis A. +7 · 2 citations
Engineering · #FOS: Physical sciences #Fault Detection and Control Systems #Optics (physics.optics) #Quantum Physics (quant-ph)
paper · pdf · doi:10.48550/arxiv.2501.08917
openalex publication_date 2025/01/15 · openalex created_date 2025/01/17 · openalex updated_date 2026/07/28
In this paper, we theoretically study spectral and temporal properties of pulsed spontaneous parametric down-conversion (SPDC) generated in lossy waveguides. Our theoretical approach is based on the formalism of Gaussian states and the Langevin equation, which is elaborated for weak parametric down-conversion and photon-number-unresolved click detection. Using the example of frequency-degenerate type-II SPDC generated under pump-idler group-velocity-matching condition, we show how the joint-spectral intensity, mode structure, normalized second-order correlation function, and Hong-Ou-Mandel interference pattern depend on internal losses of the SPDC process. In addition, we propose a new method for the experimental determination of internal losses of nonlinear waveguides which is based on the measurement of the normalized second-order correlation functions.