Mainz 2026 – wissenschaftliches Programm
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Q: Fachverband Quantenoptik und Photonik
Q 29: Poster – Quantum Technologies I
Q 29.37: Poster
Dienstag, 3. März 2026, 17:00–19:00, Philo 2. OG
Deterministic preparation and retrieval of a dark state population in a semiconductor quantum dot for generating time-bin entangled photon states. — •René Schwarz1, Florian Kappe1, Yusuf Karli1,2, Thomas Bracht3, Saimon Corve da Silva4, Armando Rastelli4, Vikas Remesh1, Doris Reiter3, and Gregor Weihs1 — 1Institute of Experimental Physics, University of Innsbruck, Innsbruck, Austria — 2Cavendish Laboratory, University of Cambridge, Cambridge, United Kingdom. — 3Condensed Matter Theory, Department of Physics, TU Dortmund, Dortmund, Germany — 4Institute of Semiconductor and Solid State Physics, Johannes Kepler University Linz, Linz, Austria
Semiconductor quantum dots are a highly versatile and promising solid-state platform for generating non-classical states of light. While state-of-the-art optical excitation methods target bright excitons or biexcitons, quantum dots can also accommodate optically dark excitons, which cannot be accessed directly via optical excitation methods. Dark exciton states exhibit significantly slower decay rates than their bright counterparts, making them ideal for the deterministic generation of time-bin entangled states [1]. In this work, we perform a full magneto-optical characterization (in-plane magnetic field) of the dark exciton state in a single GaAs/AlGaAs quantum dot emitting at ~800 nm. By combining the magnetic field mixing and chirped laser pulses, we demonstrate the deterministic preparation the dark exciton and a controlled retrieval of its population [2]. [1] Phys. Rev. Lett. 94, 030502 (2005). [2] Sci. Adv. 11.28, eadu4261 (2025)
Keywords: Quantum Dots; Semiconductor; Quantum Light–Matter Interaction; Quantum Optics; Quantum Information