Mainz 2026 – scientific programme
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Q: Fachverband Quantenoptik und Photonik
Q 29: Poster – Quantum Technologies I
Q 29.38: Poster
Tuesday, March 3, 2026, 17:00–19:00, Philo 2. OG
Tunnelling-assisted excitation of two quantum dots in a nanowire — •Akaash Srikanth1, Rohan Radhakrishnan1, Rodion Reznik3, Gilles Patriarche2, George Cirlin3, and Nika Akopian1 — 1DTU Electro, Technical University of Denmark, 2800 Kgs. Lyngby, Denmark — 2C2N, Université Paris-Saclay, CNRS, 91120 Palaiseau, France — 3St. Petersburg, Russia
Multi-quantum-dot systems provide a robust platform for realizing quantum registers and multi-photon resources such as 2D cluster states. Here, we introduce a tunneling-based excitation scheme in a system of two quantum dots. We first create a spatially indirect exciton delocalized across two dots. Subsequently, electron tunneling converts it into a spatially direct exciton, enabling a localized radiative recombination pathway and hence direct emission. To quantify how inter-dot separation shapes these dynamics, we grow a series of samples comprising two InGaAs quantum dots (growth times 2 s and 5 s) with varying spacings, embedded in AlGaAs nanowires. Finally, we assess whether this platform–scheme combination can outperform established excitation approaches, particularly (a) resonant excitation, which can lead to fluorescence loss, and (b) the SUPER scheme, which typically demands higher excitation powers.
Keywords: Nanowire; Quantum Dots; InGaAs/AlGaAs; Tunnelling; Double Quantum Dots