Dresden 2017 – scientific programme

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HL: Fachverband Halbleiterphysik

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

HL 51.4: Talk

Wednesday, March 22, 2017, 10:30–10:45, POT 112

Electrically-pumped wavelength-tunable GaAs quantum dots interfaced with rubidium atoms — •Huiying Huang¹, Rinaldo Trotta¹, Yongheng Huo¹, Thomas Lettner¹, Johannes Wildmann¹, Javier Martín-Sánchez¹, Daniel Huber¹, Marcus Reindl¹, Jiaxiang Zhang², Eugenio Zallo³, Oliver Schmidt², and Armando Rastelli¹ — ¹Institute of Semiconductor and Solid State Physics, Johannes Kepler University, Linz, Altenbergerstraße 69, 4040, Austria — ²Altenbergerstr. 69 — ³Paul-Drude-Institut für Festkörperelektronik Hausvogteiplatz 5-7, 10117 Berlin, Germany

The combination of semiconductor quantum-dots (QDs) and natural atoms may allow storing the state of single photons emitted from a QD in atomic vapors, which has the potential to become crucial ingredients for building up a quantum repeater. To achieve such interface, the QD emission has to be precisely tuned to atomic lines. In this talk, I will introduce the first light-emitting-diode based on single GaAs/AlGaAs QDs and demonstrate its operation as an energy-tunable source of photons with wavelength in resonance with the D2 transitions of 87Rb atoms. This device is a compact and completely electrically-driven source of non-classical light in which both the excitation and tunability are provided on-chip. By feeding the emitted photons into a 75-mm-long cell containing warm 87Rb atom vapor, we observe slow-light with a temporal delay of up to 3.4 ns. In view of the possibility of using 87Rb atomic vapors as quantum memories, this work makes an important step towards the realization of hybrid-quantum systems for future quantum networks.