231 citations · 657 across the 14 of their papers we have counts for
14 papers
SMOG: Scalable Meta-Learning for Multi-Objective Bayesian Optimization
Leonard Papenmeier, Petru Tighineanu
Multi-objective optimization aims to solve problems with competing objectives. Evaluating such problems is often slow or expensive, limiting the budget of evaluations. In many appl…
Scalable Meta-Learning with Gaussian Processes
Petru Tighineanu, Lukas Grossberger, Paul Baireuther +4
Meta-learning is a powerful approach that exploits historical data to quickly solve new tasks from the same distribution. In the low-data regime, methods based on the closed-form p…
Transfer Learning with Gaussian Processes for Bayesian Optimization
Petru Tighineanu, Kathrin Skubch, Paul Baireuther +3
Bayesian optimization is a powerful paradigm to optimize black-box functions based on scarce and noisy data. Its data efficiency can be further improved by transfer learning from r…
Suppressing phonon decoherence of high performance single-photon sources in nanophotonic waveguides
Chris L. Dreeßen, Claudéric Oullet-Plamondon, Petru Tighineanu +4
The fundamental process limiting the coherence of quantum-dot based single-photon sources is the interaction with phonons. We study the effect of phonon decoherence on the indistin…
Reinforcement Learning with Neural Networks for Quantum Feedback
Thomas Fösel, Petru Tighineanu, Talitha Weiss +1
Machine learning with artificial neural networks is revolutionizing science. The most advanced challenges require discovering answers autonomously. This is the domain of reinforcem…
Carrier-mediated optomechanical forces in semiconductor nanomembranes with coupled quantum wells
Andreas Barg, Leonardo Midolo, Gabija Kiršanskė +7
In the majority of optomechanical experiments, the interaction between light and mechanical motion is mediated by radiation pressure, which arises from momentum transfer of reflect…
Phonon Decoherence of Quantum Dots in Photonic Structures: Broadening of the Zero-Phonon Line and the Role of Dimensionality
Petru Tighineanu, Chris L. Dreeßen, Christian Flindt +2
We develop a general microscopic theory describing the phonon decoherence of quantum dots and indistinguishability of the emitted photons in photonic structures. The coherence is f…
Indistinguishable and efficient single photons from a quantum dot in a planar nanobeam waveguide
Gabija Kiršanskė, Henri Thyrrestrup, Raphaël S. Daveau +16
We demonstrate a high-purity source of indistinguishable single photons using a quantum dot embedded in a nanophotonic waveguide. The source features a near-unity internal coupling…
Observation of the exciton Mott transition in the photoluminescence of coupled quantum wells
Gabija Kiršanskė, Petru Tighineanu, Raphaël S. Daveau +3
Indirect excitons in coupled quantum wells have long radiative lifetimes and form a cold quasi-two-dimensional population suitable for studying collective quantum effects. Here we…
Optical refrigeration with coupled quantum wells
R. S. Daveau, P. Tighineanu, P. Lodahl +1
Refrigeration of a solid-state system with light has potential applications for cooling small-scale electronics and photonics. We show theoretically that two coupled semiconductor…
Single-photon superradiance from a quantum dot
P. Tighineanu, R. S. Daveau, T. B. Lehmann +4
We report on the observation of single-photon superradiance from an exciton in a semiconductor quantum dot. The confinement by the quantum dot is strong enough for it to mimic a tw…
Unraveling the mesoscopic character of quantum dots in nanophotonics
Petru Tighineanu, Anders Søndberg Sørensen, Søren Stobbe +1
We provide a microscopic theory for semiconductor quantum dots that explains the pronounced deviations from the prevalent point-dipole description that were recently observed in sp…
Probing electric and magnetic vacuum fluctuations with quantum dots
Petru Tighineanu, Mads Lykke Andersen, Anders Søndberg Sørensen +2
The electromagnetic-vacuum-field fluctuations are intimately linked to the process of spontaneous emission of light. Atomic emitters cannot probe electric- and magnetic-field fluct…
Decay dynamics and exciton localization in large GaAs quantum dots grown by droplet epitaxy
Petru Tighineanu, Raphaël Daveau, Eun Hye Lee +3
We investigate the optical emission and decay dynamics of excitons confined in large strain-free GaAs quantum dots grown by droplet epitaxy. From time-resolved measurements combine…