Bonn 2025 – wissenschaftliches Programm
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Q: Fachverband Quantenoptik und Photonik
Q 31: Quantum Networks, Repeaters, and QKD III (joint session Q/QI)
Q 31.7: Vortrag
Mittwoch, 12. März 2025, 12:30–12:45, AP-HS
QKD with Single Photons from Semiconductor Quantum Dots — •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
We present a BB84 QKD system based on single photons from a quantum dot (QD) source embedded into a circular bragg grating (CBG). The QD emits directly into the telecom C-band with high brightness and a low g(2)(0) of 0.7%. The encoding scheme features a phase modulator in a Sagnac configuration to inscribe four polarization states at a high modulation speed of 76MHz and with a low quantum bit error rate (QBER) on the order of 1%. We demonstrate the QKD capabilities of the system over increasing transmission distances in fiber, utilizing live polarization drift compensation and software-based synchronization, and show that it is fit for use on an intercity scale.
[1] Yang, J. et al., https://doi.org/10.1038/s41377-024-01488-0
[2] Nawrath et al., https://doi.org/10.1002/qute.202300111
Keywords: Quantum Dots; QKD; BB84; Polarization; Telecom C-Band