Regensburg 2025 – wissenschaftliches Programm
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HL: Fachverband Halbleiterphysik
HL 47: Focus Session: Quantum Technologies in Deployed Systems II
HL 47.5: Vortrag
Donnerstag, 20. März 2025, 11:45–12:00, H17
Quantum cryptography at deployed communication networks with quantum dots at telecommunication wavelengths — •Anna Friederike Köhler1, Tim Strobel1, Michal Vyvlecka1, Raphael Joos1, Ilenia Neureuther1, Timo Schnieber1, Tobias Bauer2, Marlon Schäfer2, Nand Lal Sharma3, Weijie Nie3, Ghata Bhayani3, Caspar Hopfmann3, Simone Luca Portalupi1, Christoph Becher2, and Peter Michler1 — 1Institut für Halbleiteroptik und Funktionelle Grenzflächen (IHFG), Center for Integrated Quantum Science and Technology (IQST) and SCoPE, University of Stuttgart, Allmandring 3, 70569 Stuttgart, Germany — 2Fachrichtung Physik, Universität des Saarlandes, Campus E2.6, 66123 Saarbrücken, Germany — 3Institute for Integrative Nanosciences, Leibniz IFW Dresden, Helmholtzstraße 20, 01069 Dresden, Germany
Quantum cryptography leverages quantum effects to achieve unprecedented security. Quantum dot-based nonclassical light sources hold a promise for efficient cryptographic applications, offering on-demand generation of entangled photon pairs with high brightness and negligible multi-photon contribution. These features enable high-speed quantum communication while minimizing security risks. In this work, we demonstrate the BBM92 quantum key distribution protocoll using a GaAs quantum dot source to produce high-fidelity entangled photon pairs. Frequency conversion to telecommunication wavelengths is implemented to enhance transmission efficiency in a deployed intracity silica-based fiber network.
Keywords: quantum dot; qkd; telecommunication wavelengths