Mainz 2026 – scientific programme
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Q: Fachverband Quantenoptik und Photonik
Q 81: Quantum Communication, Networks, Repeaters, & QKD III
Q 81.3: Talk
Friday, March 6, 2026, 15:00–15:15, P 10
Progress towards Intercity Quantum Key Distribution with Deterministic Sources — •Joscha Hanel1, Fabian Klingmann2, Jingzhong Yang1, Jipeng Wang1, Vincent Rehlinger1, Zenghui Jiang1, Jialiang Wang1, Eddy Patrick Rugeramigabo1, Raphael Joos3, Michael Jetter3, Ali Hreibi4, Ann-Katrin Kniggendorf4, Simone Luca Portalupi3, Peter Michler3, Stefan Kück4, Tara Liebisch1, Michael Zopf1, and Fei Ding1,5 — 1Institut für Festkörperphysik, Leibniz Universität Hannover — 2Fraunhofer-Institut für Photonische Mikrosysteme, Dresden — 3Institut für Halbleiteroptik und Funktionelle Grenzflächen, IQST and SCoPE, University of Stuttgart — 4Physikalisch-Technische Bundesanstalt, Braunschweig — 5Laboratorium für Nano-und Quantenengineering, Leibniz Universität Hannover
We report on the progress toward a deployed QKD system based on a deterministic quantum dot single photon source, and toward its practical operation on the 78 km Niedersachsen Quantum Link connecting Hannover and Braunschweig.
The system employs high-fidelity polarization encoding at a 152 MHz excitation rate and advanced polarization stabilization to maintain low-error performance and generate keys at practical rates. We further develop and implement a remote clock synchronization scheme that leverages the timing information present within the quantum signal. Our findings underline the viability of deterministic quantum emitters for scalable, real world quantum communication applications.
Keywords: Quantum Dots; Quantum Key Distribution; Polarization; Single Photons; Quantum Networks