Quantum Dots

Side excitationThe future of photonic quantum technologies relies on bright, photostable, and on-demand sources of single and indistinguishable photons. In the search for such perfect quantum light sources, semiconductor quantum dots (QD) have recently emerged as promising platforms with excellent performance characteristics. QDs benefit from their excellent photostability, nearly Fourier-limited emission linewidth, and growth technologies that allow easy integration into nanoscale devices. 

In our research subgroup on Quantum Dots, we focus on three major goals: 

(1) Develop novel excitation protocols to generate and coherently control the QD excited states, see our recent works [1-3]

(2) Generate time-bin entangled photon states from QDs [4-6]. To improve this and to get towards the deterministic generation of such states, we have recently started investigating the preparation of the biexciton state via dark exciton state in our ambitious FWF project AEQuDot, with Prof. Doris Reiter and Prof. Armando Rastelli, see [7,8] for the theoretical protocols.

(3) Designing and fabricating photonic cavity structures on QDs for high brightness single photons [9] for our multiphoton interference experiments in our FWF project FG5: Multiphoton Experiments with Quantum Dots  with Prof. Armando Rastelli, Prof. Philipp Walther, and Prof. Barbara Kraus

(4) Designing quantum dot nanopillar structures to engineering collective effects like subradiance, towards understanding the energy trapping mechanisms in natural light-harvesting complexes in our latest FWF TAI project DarkEneT: Engineering Dark modes for Energy Trapping 

We mostly work with InAs/GaAs quantum dots grown and/or provided by our various collaborators: D. Dalacu and P. Poole (NRC Ottawa), A. Rastelli (JKU Linz), and G. Solomon (Uni. Adelaide).

[1] Kappe et al., https://arxiv.org/abs/2209.08972 

[2] Karli et al., https://pubs.acs.org/doi/10.1021/acs.nanolett.2c01783

[3] Bracht et al., https://arxiv.org/abs/2211.08176

[4] Jayakumar et al. https://doi.org/10.1038/ncomms5251 

[5] Aumann et al. https://doi.org/10.1063/5.0081874 

[6] Prilmueller et al. https://doi.org/10.1103/PhysRevLett.121.110503

[7] Lueker et al. https://doi.org/10.1103/PhysRevB.92.201305

[8] Neumann et al., https://doi.org/10.1103/PhysRevB.104.075428

[9] Liu et al., https://doi.org/10.1038/s41565-019-0435-9



ERC LogoOur past works were supported by the ERC Starting Grant "EnSeNa - Entanglement from Semiconductor Nanostructures" (No. 257531)

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