Freiburg 2024 – scientific programme
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Q: Fachverband Quantenoptik und Photonik
Q 51: Quantum Optical Correlations
Q 51.7: Talk
Thursday, March 14, 2024, 16:15–16:30, HS 1199
Simulations of Hong-Ou-Mandel interference for parametric down-conversion in lossy waveguides — •Denis Kopylov1,2, Polina Sharapova1, Silia Babel3, Laura Padberg3, Michael Stefszky3, Christine Silberhorn3, and Torsten Meier1,2 — 1Department of Physics, Paderborn University, Warburger Str. 100, 33098 Paderborn, Germany — 2Institute for Photonic Quantum Systems (PhoQS), Paderborn University, Warburger Str. 100, 33098 Paderborn, Germany — 3Paderborn University, Integrated Quantum Optics, Institute of Photonic Quantum Systems (PhoQS), Warburger Str. 100, 33098 Paderborn, Germany
Nowadays, parametric down-conversion (PDC) provides a flexible framework for the experimental realization of various types of non-classical light. Waveguide-based PDC sources are especially relevant for integrated quantum optical circuits, however imperfections of long nonlinear waveguides may lead to losses of the PDC field and consequently the desired quantum state cannot be realized exactly.
In this work we study numerically the Hong-Ou-Mandel (HOM) interference for PDC, generated in lossy nonlinear waveguides and show how the HOM interference pattern reveals the presence of losses. In our approach we solve the Heisenberg-Langevin equation for broadband multimode type-II PDC. Hong-Ou-Mandel interference is calculated in the framework of Gaussian states detected with click-detectors which allow us to study the non-perturbative PDC regime. The difference between internal waveguide losses and coupling losses of PDC on the HOM interference is demonstrated and analyzed.
Keywords: parametric down-conversion; Hong-Ou-Mandel interference; nonlinear waveguides; Langevin equation