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Regensburg 2022 – scientific programme

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HL: Fachverband Halbleiterphysik

HL 8: Quantum Dots and Wires 2: Optics 1

HL 8.7: Talk

Monday, September 5, 2022, 17:15–17:30, H32

Red Detuned Excitation of a Quantum Dot — •Yusuf Karli1, Florian Kappe1, Thomas Bracht2, Julian Münzberg1, Tim Seidelmann3, Vollrath Martin Axt3, Saimon Covre da Silva4, Armando Rastelli4, Vikas Remesh1, Doris Reiter5, and Gregor Weihs11Institute für Experimentalphysik, Universität Innsbruck, Innsbruck, Austria — 2Institut für Festkörpertheorie, Universität Münster, Münster, Germany — 3Theoretische Physik III, Universität Bayreuth, Bayreuth, Germany — 4Institute of Semiconductor and Solid State Physics, Johannes Kepler University Linz, Linz, Austria — 5Condensed Matter Theory, Department of Physics, TU Dortmund, Dortmund, Germany

Semiconductor quantum dots have emerged as promising sources of highly indistinguishable single photons. To operate as an on-demand photon source, a quantum dot must be prepared in its exciton state, for which, several protocols exist. A recent remarkable theoretical discovery, also presented at this conference, showed that the exciton state in a quantum dot can be efficiently populated by two red-detuned pulses in a swing-up mechanism. We demonstrate the experimental implementation of this mechanism relying on amplitude-shaping of a broadband laser pulse in a 4f shaper including a spatial light modulator. The decisive advantage of our scheme is that both pulses are red-detuned and therefore, no higher-lying states of the quantum dot will be directly addressed. Our results contribute towards an effortless method for generating high-purity single photons, yet most importantly, removing the need for stringent polarization filtering.

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