Spectral and temporal properties of type-II parametric down-conversion: The impact of losses during state generation

• URL: http://arxiv.org/abs/2501.08917v1
• Date: Wed, 15 Jan 2025 16:22:47 GMT
• Title: Spectral and temporal properties of type-II parametric down-conversion: The impact of losses during state generation
• Authors: Denis A. Kopylov, Michael Stefszky, Torsten Meier, Christine Silberhorn, Polina R. Sharapova,
• Abstract summary: We study spectral and temporal properties of pulsed spontaneous parametric down-conversion generated in lossy waveguides. 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.
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• Abstract: 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.

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