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HL: Fachverband Halbleiterphysik
HL 24: Quantum dots: Optics
HL 24.2: Talk
Wednesday, March 29, 2023, 09:45–10:00, POT 151
Collective Excitation of Spatio-Spectrally Distinct Quantum Dots Enabled by Chirped Pulses — Florian Kappe1, Yusuf Karli1, Thomas Bracht2, Saimon Covre da Silva3, Tim Seidelmann4, Vollrath Martin Axt4, Armando Rastelli3, Gregor Weihs1, Doris Reiter2,5, and •Vikas Remesh1 — 1Institute für Experimentalphysik, Universität Innsbruck, Innsbruck, Austria — 2Institut für Festkörpertheorie, WWU Münster, Münster, Germany — 3Institute of Semiconductor and Solid State Physics, Johannes Kepler University Linz, Linz, Austria — 4Theoretische Physik III, Universität Bayreuth, Bayreuth, Germany — 5Condensed Matter Theory, TU Dortmund, Dortmund, Germany
To boost the communication rate in quantum communication devices, it is desirable to have an ensemble of single photon sources that can be collectively excited, despite their spectral variability. Rabi rotation, the most popular method for resonant excitation of the quantum dot, cannot assure a highly efficient state preparation, due to its sensitivity to the excitation parameters. Here, we demonstrate the robustness of Adiabatic Rapid Passage, using chirped laser pulses and collectively excite biexciton states [1] in energetically and spatially distinct quantum dots. We also demonstrate a regime of phonon contribution that widens the detuning range. Being able to generate high-purity photons from spatially multiplexed quantum dot sources with high efficiency is a big step towards the implementation of high photon rate quantum key distribution protocols. [1] Kappe et al, https://arxiv.org/abs/2209.08972 (in peer review)