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QI: Fachverband Quanteninformation
QI 45: Quantum Technologies (Solid State Systems) (joint session Q/QI)
QI 45.4: Talk
Friday, March 14, 2025, 15:15–15:30, HS I
Deterministic preparation and retrieval of the dark state population in a quantum dot — •René Schwarz1, Florian Kappe1, Yusuf Karli1, Thomas Bracht2, Saimon Covre da Silva3, Armando Rastelli3, Vikas Remesh1, Doris Reiter2, and Gregor Weihs1 — 1Institute of Experimental Physics, University of Innsbruck, Innsbruck, Austria — 2Condensed Matter Theory, Department of Physics, TU Dortmund, Dortmund, Germany — 3Institute of Semiconductor and Solid State Physics, Johannes Kepler University Linz, Linz, Austria
Semiconductor quantum dots are arguably the most promising platform for future quantum technologies. Due to the confinement of charge carriers, a variety of photon states can be generated, making them a highly adaptable quantum platform. While state-of-the-art optical excitation methods target the so-called bright excitons or biexcitons, quantum dots also accommodate optically dark excitons, which are not directly accessible via optical excitation methods. The dark exciton states exhibit significantly slower decay rates compared to their bright counterparts, making them potential candidates for application in quantum information protocols that require control of quantum coherence over long time scales [1]. In this work, we perform a full magneto-optical characterization (in-plane magnetic field) as well as a deterministic preparation and retrieval of the dark exciton state population in a single GaAs/AlGaAs quantum dot emitting at ~ 800 nm using a combination of a magnetic field and chirped laser pulses [2]. [1] Phys. Rev. Lett. 94, 030502 (2005). [2] arXiv, 2404.10708 (2024)
Keywords: Quantum Dots; Quantum Optics; Quantum Information; Semiconductors