Dresden 2017 – wissenschaftliches Programm
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HL: Fachverband Halbleiterphysik
HL 63: Poster: Quantum Dots and Optics
HL 63.19: Poster
Mittwoch, 22. März 2017, 15:00–19:00, P1A
Interfacing single QD photons with Cesium Vapor — •Janik Wolters1, Tim Kroh2, Alexander Thoma3, Stephan Reitzenstein3, Rinaldo Trotta4, Eugenio Zallo5, Armando Rastelli4, Oliver G. Schmidt6, and Oliver Benson2 — 1Universität Basel — 2Humboldt-Universität zu Berlin — 3Technische Universität Berlin — 4Johannes Kepler Universität Linz — 5Paul-Drude-Institut für Festkörperelektronik, Berlin — 6IFW Dresden
Hybrid quantum dot-atom systems might become a key ingredient for future heterogeneous quantum networks. In such a heterogenous quantum network quantum dots may serve as fast and efficient deterministic single photon sources, while atomic ensembles can be used to store quantum information with sufficiently long storage time, fidelity and efficiency to realize e.g. long distance quantum repeater links. A first step towards this vision is to interface single photons emitted by a semiconductor quantum dot with one single atomic hyperfine transition.
We have performed this step using a strain tunable InGaAs quantum dot emitting at 894 nm, corresponding to the Cs D1 line. The QD is excited non-resonantly by 50 ps laser pulses and precisely tuned the absorption minimum between two hyperfine transitions of the Cs D1 line. Under these conditions, strong dispersion occurs and already at moderate optical densities photons are slowed down to ∼ c / 20, where c is the speed of light in vacuum. This result is an important first step towards storage of the photons in a quantum memory with on-demand storage and retrieval.