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Q: Fachverband Quantenoptik und Photonik
Q 62: Poster – Quantum Information Technologies (joint session Q/QI)
Q 62.37: Poster
Donnerstag, 13. März 2025, 17:00–19:00, Tent
Real-time QKD with a deterministic sub-poissonian Source on an Intercity Scale — •Joscha Hanel1, Jingzhong Yang1, Jipeng Wang1, Vincent Rehlinger1, Zenghui Jiang1, Frederik Benthin1, Tom Fandrich1, Jialiang Wang1, Fabian Klingmann2, Raphael Joos3, Stephanie Bauer3, Sascha Kolatschek3, Ali Hreibi4, Eddy Rugeramigabo1, Michael Jetter3, Simone Portalupi3, Michael Zopf1,5, Peter Michler3, Stefan Kück4, 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
While quantum key distribution (QKD) is among the most mature quantum technologies today, it remains a considerable challenge to achieve practical transmission rates over long distances with sub-poissonian photon sources. However, use of such sources is desirable in the long run, as they facilitate integration into future receiver-based networks.
We present a polarization-based BB84-QKD system using a quantum dot (QD) as a bright, pure, and deterministic single photon source that emits into the telecom C-band. We employ active polarization stabilization and both spectral and temporal filtering to demonstrate positive secure key rates in the kbit/s range for transmission distances on the intercity scale.
Keywords: Quantum Dots; QKD; BB84; Polarization; Telecom C-Band