Regensburg 2022 – wissenschaftliches Programm
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HL: Fachverband Halbleiterphysik
HL 26: Quantum Dots and Wires 5: Optics 2
HL 26.4: Vortrag
Donnerstag, 8. September 2022, 10:15–10:30, H32
Ultrafast electric control of cavity mediated photons from a semiconductor quantum-dot — •David Bauch1, Dirk Heinze1, Jens Förstner1, Klaus D. Jöns1, and Stefan Schumacher1,2 — 1Department of Physics and CeOPP, Paderborn University, Germany — 2College of Optical Sciences, University of Arizona, Tucson, USA
On demand sources for single photon and photon pairs are essential for quantum communication protocols. Exciton and cascaded biexciton-exciton transitions in semiconductor quantum dots offer the potential for optically controlled generation of a single photon [1] and polarization-entangled twin photons [2]. In addition to pure optical control, externally applied time-dependent electric fields enable control of the (bi-)exciton resonance through the quantum confined Stark effect, resulting in changes of the (bi-)exciton dynamics and the resulting photon emission. Here we investigate theoretically the optical excitation of the (bi-)exciton state off-resonant to a cavity mode followed by ultrafast control of the states, which then allows for cavity-resonant emission of the photons. Our scheme allows for high preparation fidelities followed by the generation of highly indistinguishable single photons and polarization entangled twin-photons via the biexciton-exciton cascade and biexciton two-photon emission with high emission probabilities [3].
[1] D. Heinze, D. Breddermann, A. Zrenner, S. Schumacher, Nat. Commun. 6, 8473 (2015). [2] D. Heinze, A. Zrenner, S. Schumacher, Phys. Rev. B 95, 245306 (2017). [3] D. Bauch, D. Heinze, J. Förstner, K. D. Jöns, S. Schumacher, Phys. Rev. B 104, 085308 (2021).