Bonn 2025 – wissenschaftliches Programm
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QI: Fachverband Quanteninformation
QI 18: Quantum Networks, Repeaters, and QKD III (joint session Q/QI)
QI 18.5: Vortrag
Mittwoch, 12. März 2025, 12:00–12:15, AP-HS
Towards compensation of component imperfections in polarization-based BB84 QKD transmitters — •Silas Eul1,2, 3, Joost Vermeer1, 3, Domenico Paone2, Ömer Bayraktar1, 3, Julian Struck2, and Christoph Marquardt1,3 — 1Friedrich-Alexander-Universität Erlangen-Nürnberg, Staudtstr. 7, 91058 Erlangen, Germany — 2Tesat-Spacecom GmbH & Co. KG, Gerberstr. 49, 71522 Backnang, Germany — 3Max Planck Institute for the Science of Light, Staudtstr. 2, 91058 Erlangen, Germany
Quantum key distribution systems typically rely on components that are highly polarization-dependent, such as polarization splitters and waveplates, as well as components that are intended to keep the polarization intact, such as fibers or non-polarizing beam splitters. In a real case scenario, there are no perfect components and the polarization errors generally increase when using smaller components, for example when transitioning from free space to fiber-based to photonic integrated circuit-based setups. In this work the influence of these components is discussed and possibilities to compensate, minimize or bypass these problems are highlighted. Here we focus on transmitters for polarization-based BB84 for free space and satellite applications.
Keywords: Quantum Key Distribution; Quantum Communication; Satellite; Polarization Encoding