Dresden 2017 – wissenschaftliches Programm

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HL: Fachverband Halbleiterphysik

HL 51: Focus Session: Hybrid Quantum-Dot / Atom Systems

HL 51.5: Hauptvortrag

Mittwoch, 22. März 2017, 10:45–11:15, POT 112

Strain-tunable quantum dots interfaced with atomic vapors — •Rinaldo Trotta — Institute of Semiconductor and Solid State Physics, Johannes Kepler University Linz, Linz, Altenbergerstrasse 69, 4040, Austria

The development of quantum networks for the distribution of quantum information among distant parties will bring about a revolution in communication science and technology. Addressing this task successfully will most likely require merging different quantum systems, where the advantages of the different constituents are combined. Hybrid natural-atomic interfaces between semiconductor quantum dots (QDs) and atomic vapors are currently emerging as a promising route for quantum networking. However, coupling the two physical systems requires several outstanding challenges to be overcome. One challenge is to match the energy of the single and entangled photons emitted by QDs to absorption lines of the atomic vapors. In this talk, I will discuss how external strain fields provided by piezoelectric actuators can be used to address this task successfully [1,2,3]. In particular, I will show how full control over the QD in-plane strain tensor allows the energy of the entangled photons emitted by QDs to be precisely controlled in the spectral range in which a cloud of natural atoms behaves as a slow-light medium.

[1] J. S. Wildmann et al., Phys. Rev. B 92, 235306 (2015) [2] H. Huang et al., arXiv:1602.02122 [3] R. Trotta et al., Nature Comm. 7, 10375 (2016).