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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 Zopf^1,5, Peter Michler³, Stefan Kueck⁴, and Fei Ding^1,5 — 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