Regensburg 2025 – scientific programme
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HL: Fachverband Halbleiterphysik
HL 29: Poster II
HL 29.74: Poster
Tuesday, March 18, 2025, 18:00–20:00, P1
Experimental time-bin encoding quantum key distribution with telecom semiconductor quantum dot — •Jipeng Wang1, Jingzhong Yang1, Joscha Hanel1, Zenghui Jiang1, Vincent Rehlinger1, Raphael Joos2, Stephanie Bauer2, Sascha Kolatschek2, Eddy Rugeramigabo1, Michael Jetter2, Simone Portalupi2, Michael Zopf1,3, Peter Michler2, and Fei Ding1,3 — 1Leibniz Universität Hannover, Institut für Festkörperphysik, Appelstraße 2, 30167 Hannover — 2Institut für Halbleiteroptik und Funktionelle Grenzflächen, Center for Integrated Quantum Science and Technology (IQST) and SCoPE, University of Stuttgart, Stuttgart, Germany. — 3Laboratorium für Nano-und Quantenengineering, Leibniz Universität Hannover, Schneiderberg 39, 30167 Hannover, Germany
Quantum Key Distribution (QKD) enables secure data transmission via quantum-generated secret keys. Semiconductor quantum dots (QDs) are promising light sources for high-speed quantum networks due to their deterministic single-photon emission. However, polarisation stability in fibre networks is often disrupted by environmental factors. Here, we demonstrate a QKD experiment using time-bin qubits derived from polarised photons emitted by a QD in the telecommunication C-band. A 16-bit pseudo-random sequence is encoded via a Sagnac-loop interferometer and decoded using an unbalanced Mach-Zehnder interferometer after transmission through 80 km of fibre. This study highlights QDs' potential for scalable, robust quantum networks.
Keywords: quantum dot; quantum key distribution; quantum communication; time-bin; C-band