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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 (IQ^ST) 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