Mainz 2017 – scientific programme
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Q: Fachverband Quantenoptik und Photonik
Q 12: Nano-Optics I
Q 12.6: Talk
Monday, March 6, 2017, 18:15–18:30, P 11
QD single photons delayed in cesium vapor — •Tim Kroh1, Janik Wolters2, Alexander Thoma3, Stephan Reitzenstein3, Rinaldo Trotta4, Eugenio Zallo5, Armando Rastelli4, Oliver G. Schmidt6, and Oliver Benson1 — 1Humboldt-Universität zu Berlin — 2Universität Basel — 3Technische Universität Berlin — 4Johannes Kepler Universität Linz — 5Paul-Drude-Institut für Fest-körperelektronik, Berlin — 6IFW Dresden
In forthcoming quantum networks various quantum systems might be involved to accomplish individual tasks, including storage of quantum states, quantum logic operations, error correction, or entanglement distillation. An interface between a single photon emitter and a potential photon storage could provide one fundamental building block of such a hybrid quantum system.
In our experiment this is realized by setting the exciton emission of a strain-tunable InGaAs quantum dot to the cesium D1 line at 894 nm. Under pulsed, non-resonant excitation the QD single photons are delayed in atomic cesium vapor by strong dispersion between two hyperfine-split levels of the D1 transition. This allows for delay times of a few nanoseconds even at low optical densities, resulting in a propagation velocity at the order of 1/20 of the vacuum speed of light. Such a single photon - atom interface might lay the foundations for a low-loss quantum memory in a future hybrid quantum network.