Berlin 2018 – wissenschaftliches Programm

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HL: Fachverband Halbleiterphysik

HL 31: Quantum information systems (joint session HL/TT)

HL 31.7: 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)