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HL: Fachverband Halbleiterphysik

HL 47: Focus Session: Quantum Technologies in Deployed Systems II

HL 47.2: Hauptvortrag

Donnerstag, 20. März 2025, 10:00–10:30, H17

Field test of semiconductor quantum light sources — •Fei Ding — Leibniz University Hannover, Germany

Semiconductor quantum dots (QDs) are among the most promising quantum light sources, with the potential to revolutionize quantum communication research. For instance, utilizing on-demand single photons and entangled photons in quantum key distribution (QKD) protocols can significantly enhance security and increase the maximum tolerable loss. However, several critical challenges must be addressed to bridge the gap between laboratory experiments and long-distance field tests using QDs. In this talk, I will first review our work over the past years on QD-based single-photon and entangled-photon sources. Following that, I will present our recent field tests of single photon transmissions over a 79 km link between Hannover and Braunschweig, with 25.49 dB loss, equivalent to 130 km in direct-connected optical fiber.

Keywords: quantum communication; semiconductor; quantum dot; single photons