Bonn 2025 – scientific programme
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Q: Fachverband Quantenoptik und Photonik
Q 48: Poster – Quantum Optics, Technologies, and Optomechanics
Q 48.17: Poster
Wednesday, March 12, 2025, 17:00–19:00, Tent
Design of a decorrelated PDC source at telecom wavelenghts in TFLN waveguides — •Ernst-Lukas Kuhlmann, Silia Babel, Laura Bollmers, Werner Ridder, Christian Golla, Sebastian Lengeling, Christof Eigner, Laura Padberg, and Christine Silberhorn — Paderborn University, Integrated Quantum Optics, Institute for Photonic Quantum Systems (PhoQS), Warburger Str. 100, 33098, Paderborn, Germany
Integrated quantum optics plays a key role in communication and computation and its most fundamental building block are single photons. A promising material platform for photonics in this field is thin-film lithium niobate (TFLN). While integrated optics in conventional lithium niobate profit from its wide transparency window and high nonlinearity, its application in a thin-film configuration additionally encompasses the potential for high conversion efficiencies due to large mode confinement. Therefore, TFLN is an excellent platform for the integration of photon pair sources. Here, we explore the use of periodically poled, MgO-doped TFLN for decorrelated type II parametric down-conversion(PDC) single photon telecom C band wavelength sources with a 0-degree phase matching angle. This offers the advantage to create pure signal photons in arbitrary temporal shapes. We examine the necessary geometry parameters for such a PDC source and the influence of these parameters on the spectral shape. Moreover, we discuss possibilities to reconstruct it with adaptive poling or by tapering the waveguide width. With this work, we aim to contribute to the development of more efficient and accessible quantum light sources.
Keywords: Parametric Down Conversion (PDC); Lithium Niobate; Integrated Optics; Waveguides