Berlin 2018 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 71: Quantum Information Systems (joint session HL/TT)
TT 71.7: Vortrag
Mittwoch, 14. März 2018, 16:45–17:00, EW 203
Towards atomic vapor based memories for quantum dot single photons - A variable EIT delay in Cesium — •Tim Kroh1, Esteban Gomez Lopez1, Janik Wolters2, Alexander Thoma3, Stephan Reitzenstein3, Joahnnes S. Wildmann4, 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 Festkörperelektronik, Berlin — 6IFW Dresden
Quantum memories will play a central part in synchronizing operational events in quantum networks, e.g. joint measurements between photons from different sources in order to implement entanglement swapping in quantum repeater protocols [1].
Here, we interface quantum light sources with an electromagnetically induced transparency (EIT) system, in principle suitable for quantum memory. First, we demonstrate precise strain-tuning of InGaAs quantum dot emission between the two 1.2 GHz hyperfine-split levels in the Cesium D1 transitions. Proceeding from this we explore the potential of EIT for variable delays for single photons [2]. In addition to application in synchronization of heralded single photon sources, these experiments lay the ground for atomic vapor-based quantum memories in hybrid quantum networks [3].
[1] Kimble, Nature 453, 1023 (2008)
[2] D. Höckel et al., Phys. Rev. Lett. 105, 153605 (2010)
[3] J. Wolters et al., Phys. Rev. Lett. 119, 060502 (2017)