Bonn 2025 – wissenschaftliches Programm
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Q: Fachverband Quantenoptik und Photonik
Q 3: Photonics I
Q 3.7: Vortrag
Montag, 10. März 2025, 12:45–13:00, HS Botanik
Chirped pulses enable robust generation of multiplexed photon states in quantum dots — •Vikas Remesh1, Moritz Kaiser1, Gabriela Militani1, René Schwarz1, Ria Krämer2, Stefan Nolte2, Philip Poole3, Dan Dalacu3, and Gregor Weihs1 — 1Institute für Experimentalphysik, Universität Innsbruck, Innsbruck, Austria — 2Institute for Applied Physics, Friedrich Schiller University Jena, Germany — 3National Research Council of Canada, Ottawa, Ontario K1A 0R6, Canada
To realize a scalable source of frequency-multiplexed single photons, one requires an ensemble of quantum emitters that can be collectively excited with high efficiency. Semiconductor quantum dots hold great potential here. The most efficient scheme is to use chirped laser pulses, due to the robustness against spectral and intensity fluctuations. Here we present a compact, robust, and plug-and-play alternative for chirped pulse excitation of quantum dots, based on chirped fiber Bragg gratings. Using this technique, we demonstrate the collective excitation of vertically stacked, frequency-multiplexed quantum dots in a nanowire, producing high-quality single and entangled photon states. Our experiments set a benchmark towards a simpler yet scalable and resource-efficient approach of producing multiphoton states from quantum dots. APL Photonics 8, 101301 (2023), arxiv.org/abs/2409.13981, Adv Quantum Technol. 2024, 2300352
Keywords: quantum dots; chirped pulses; single photons; chirped fiber Bragg gratings