Freiburg 2019 – wissenschaftliches Programm

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FM: Fall Meeting

FM 53: Enabling Technologies: Sources of Quantum States of Light III

FM 53.2: Talk

Mittwoch, 25. September 2019, 14:30–14:45, 1010

Towards Coupling Quantum Dots to a Rb-Memory — •Liang Zhai1, Matthias C. Löbl1, Giang N. Nguyen1,2, Jan-Philipp Jahn1, Julian Ritzmann2, Andreas D. Wieck2, Armando Rastelli3, Arne Ludwig2, and Richard J. Warburton11University of Basel, 4056 Basel, Switzerland — 2Ruhr-Universität Bochum, 44780 Bochum, Germany — 3Johannes Kepler University Linz, 4040 Linz, Austria

Combining a solid-state quantum dot (QD) with an atomic memory is a promising hybrid-system for application in quantum communication [1]. Coupling the QD to a quantum memory, such as a Rb-memory, can circumvent the short coherence time of QDs. For coupling both systems, the photons emitted by the QD have to match the atomic ensemble in bandwidth and frequency [2,3].
We use droplet-etched GaAs QDs embedded in AlGaAs as a source of coherent single photons and investigate how their optical properties are connected to the QD-growth [4]. For tuning the QD-frequency we present two approaches: Applying mechanical strain to the sample [5] and applying an electric field to QDs in a diode structure [6, 7].
[1] N. Sangouard et al., Phys. Rev. A 76, 050301 (2007).
[2] J.-P. Jahn et al., Phys. Rev. B 92, 245439 (2015).
[3] L. Beguin et al., Phys. Rev. B 97, 205304 (2018).
[4] M. C. Löbl et al., arXiv:1902.10145 (2019).
[5] D. Huber et al., Phys. Rev. Lett. 121, 033902 (2018).
[6] L. Bouet et al., Appl. Phys. Lett. 105, 082111 (2014).
[7] F. Langer et al., Appl. Phys. Lett. 105, 081111 (2014).

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