Regensburg 2025 – wissenschaftliches Programm
Bereiche | Tage | Auswahl | Suche | Aktualisierungen | Downloads | Hilfe
HL: Fachverband Halbleiterphysik
HL 42: Quantum Dots and Wires: Optics I
HL 42.1: Hauptvortrag
Mittwoch, 19. März 2025, 16:45–17:15, H17
Quantum key distribution with single photons from 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. Patrick Rugeramigabo1, Michael Jetter3, Simone. Luca Portalupi3, Michael Zopf1,5, Peter Michler3, Stefan Kueck4, and Fei Ding1,5 — 1Leibniz Universität Hannover, Hannover, Germany — 2Fraunhofer-Institut für Photonische Mikrosysteme, Dresden, Germany — 3Institut für Halbleiteroptik und Funktionelle Grenzflächen, Center for Integrated Quantum Science and Technology (IQST) and SCoPE, University of Stuttgart, Stuttgart, Germany — 4Physikalisch-Technische Bundesanstalt, Braunschweig, Germany — 5Laboratorium für Nano-und Quantenengineering, Hannover, Germany
Quantum key distribution (QKD) ensures secure communication against eavesdroppers. On-demand quantum light sources, such as semiconductor quantum dots (QDs), enhance QKD security and loss tolerance due to their deterministic single-photon emission with high brightness and low multiphoton rates. Here, we demonstrate high-speed modulation of telecom C-band single photons emitted from a QD embedded in a circular Bragg grating. Using a phase-modulator in a Sagnac-loop interferometer, a 16-bit pseudo-random sequence is encoded into polarisation states in real time at a 76 MHz clock rate, achieving an ultra-low quantum bit error rate of ~1%.
Keywords: Quantum dots; Quantum key distribution; Photonic structure; Single photons; Telecommunication