Regensburg 2019 – wissenschaftliches Programm

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HL: Fachverband Halbleiterphysik

HL 26: Focus Session: Quantum light sources for applications in quantum communication networks

HL 26.3: Hauptvortrag

Mittwoch, 3. April 2019, 10:15–10:45, H34

Phonon-assisted bright and dark exciton preparation in a semiconductor quantum dot — •Doris Reiter — Institut für Festkörpertheorie, Universität Münster, 48149 Münster, Germany

To use semiconductor quantum dots as source of single or entangled photons, a reliable control of the excitonic states in a quantum dot is required. An obstacle to overcome for several preparation schemes like Rabi rotations or adiabatic rapid passage is the interaction of the electrons with the phonons, which in these schemes may strongly hinder the state preparation [1]. In contrast, the phonon-assisted state preparation makes use of phonons to prepare the exciton or biexciton state in a robust way [2]. Phonon-assisted schemes in combination with a tilted magnetic field can further be used to prepare the dark exciton in a quantum dot, which has parallel electron and hole spin and hence is optically inactive [3]. The dark exciton state can be very useful for a controlled biexciton preparation to act as source of entangled photons. In my talk, I will discuss how to make use of the electon-phonon interaction to prepare different exciton states.

[1] Reiter et al., J. Phys.: Condens. Matter 26, 423203 (2014)

[2] Barth et al., Phys. Rev. B 94, 045306 (2016)

[3] Lüker et al., Phys. Rev. B 95, 195305 (2017)