University of Basel

Department
of Physics

Quantum Coherence Lab - Zumbühl Group

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On arXiv: Progress in cooling nanoelectronic devices to ultra-low temperatures

A number of groups worldwide are working to produce sub-millikelvin on-chip electron temperatures, motivated by the possibility to observe new physics and improving quantum device performance. In this review, we focus on on-chip…
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On arXiv: Quantum device fine-tuning using unsupervised embedding learning

We experimentally demonstrate an algorithm capable of fi ne-tuning several device parameters at once. The algorithm acquires a measurement, scores it using a variational auto-encoder, and optimizes gate voltage via the score in real-time in…
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Published in PRB: Symmetry breaking of the persistent spin helix in quantum transport

We introduce a new spin quantization axis via the persistent spin helix, revealing a full decoupling of the Cooperon triplet scattering modes as well as decoupled Landau levels. This makes it possible to derive a closed-form expression for…
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Asser Elsayed, Imec Leuven, starts EMP access on Si and GeSi Qubit materials

Asser Elsayed from the group of Dr. Iuliana Radu and Dr. Bogdan Govoreanu, Imec Leuven, Belgium, is starting a user access project on the Basel node of the European Microkelvin Platform (EMP). The project is working to develop Si and GeSi…
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New on the arXiv: Machine learning automatic tuning of a quantum dot

We demonstrate a statistical tuning algorithm that navigates the entire large parameter space of a gate-defined quantum dot. Using just a few modelling assumptions, we demonstrate fully automated tuning to the double dot regime.This also…
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Mathieu de Kruijf, TU Eindhoven, starts EMP access on Si:finFET Spin Qubit

Mathieu de Kruijf from the group of Prof. Erik Bakkers, TU Eindhoven, is starting a user access project on the Basel node of the European Microkelvin Platform (EMP). The project is working to implement hole spins in gate defined Si finFET…
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NCCR Spin Qubits announced today!

Today, the Swiss Federal Council and the SNSF have announced six new national research programs, among them the NCCR SPIN, hosted at the Department of Physics at the University of Basel, collaborating with partners IBM, EPFL and ETHZ. The…
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Orson van der Molen starts EMP user access on direct-Rashba spin qubit

Orson van der Molen from the group of Prof. Erik Bakkers, TU Eindhoven, is starting a user access project on the Basel node of the European Microkelvin Platform (EMP). The project is working to implement hole spins in gate defined Ge/Si…
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Prof. Silke Bühler-Paschen gives Basel Physics Colloquium!

Today, Prof. Silke Bühler-Paschen from the Institute of Solid State Physics of the Technical University of Vienna, Austria, is giving the Basel Physics Colloquium, with title "Correlations with drive - New phases and excitations in quantum…
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Pierre Chevalier Kwon joins as PhD student

With a MSc in Nanosciences and a BSc in Physics from the University of Paris IX, Saclay, Pierre is starting his PhD thesis on Ge/Si nanowire spin qubits. Welcome to the group, looking forward to work with you!
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Ares Group starts European Microkelvin Platforn User Access on Machine Learning

Dominic Lennon from the group of Dr. Natalia Ares, Oxford University, has started a user access project on the Basel node of the European Microkelvin Platform (EMP). The project is working to implement machine learning to search for Pauli…
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FET project TOPSQUAD launched: TOpologically Protected and Scalable QUAntum Bits

The consortium consisting of Uni Basel, TU Eindhoven, Uni Twente and IST Vienna plus start-ups nano-PHAB and BASPI is setting out to explore Majorana fermions in Ge/Si core/shell nanowires. The hole carriers in this system are subject to…
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New on the arXiv: Low-symmetry nanowires for enhanced Dresselhaus spin-orbit interaction

We study theoretically the Dresselhaus spin-orbit interaction (SOI) in zinc-blende nanowires of various growth directions. While the Dresselhaus SOI is suppressed for select directions and confinements, many configurations allow for a…
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Published in npj Quantum Information: Efficiently measuring a quantum device using machine learning

Machine learning algorithm performing fully automatic measurements on the GaAs quantum dot, guessing most informative measurements using probabilistic deep-generative model, giving a speed-up of about a factor of 4. Collaboration with…
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Simon Svab presents his MSc thesis research

Simon Svab successfully completed his MSc thesis "g-factor anisotropy in a lateral GaAs spin qubit" and presented his results to the group today. Congratulations, Simon, on an outstanding thesis, and thanks very much for all the work! After…
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