Berlin 2015 – wissenschaftliches Programm

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HL: Fachverband Halbleiterphysik

HL 95: Poster IV B (Quantum dots and wires: Prepration, characterization, optical properties, and transport)

HL 95.10: Poster

Donnerstag, 19. März 2015, 14:00–20:00, Poster B

Two-photon interference measurements on photons from quantum dots excited via a two-photon excitation scheme — •Hüseyin Vural, Eva Schöll, Sascha Kolatschek, Markus Müller, and Peter Michler — Institut für Halbleiteroptik und Funktionelle Grenzflächen, Universität Stuttgart, Allmandring 3, 70569 Stuttgart, Germany

Indistinguishable photons are basic building blocks for quantum information processing and quantum communication. As single-photon sources, semiconductor quantum dots (QDs) are promising candidates for the generation of highly indistinguishable photons. In this work we investigate photons emitted by the biexciton state of a single InGaAs QD, which are generated via a pulsed, coherent and resonant two-photon excitation. The theory predicts the visibility of the two-photon interference to be given by the coherence time of the photons and the lifetime of the state. The measured two-photon interference of the biexciton photons provides a value of the visibility which fits the theory. Furthermore, the influence of the excitation laser pulse width on the visibility is investigated.