University of Basel

Department
of Physics

Quantum Coherence Lab - Zumbühl Group

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gates

Appearing in Materials for Quantum Computation: High mobility SiMOSFETs fabricated in a full 300mm CMOS process

The quality of the gate stack affects the local disorder potential and plays a key role for hosting spin qubits. Here, we report a record electron mobility of 17'500 cm2/Vs with sub-10nm oxide with a PolySi gate, indicating a relatively low…
Bridging

On arXiv: Bridging the reality gap in quantum devices with physics-aware machine learning

We employ physics-aware machine learning to infer the disorder potential of a nanoscale electronic device from electron transport data. The algorithm uses an approach combining a physical model, deep learning, Gaussian random fields, and…
Map

Site-Visit of NCCR SPIN in Basel

The Swiss Science Foundation is visiting the NCCR SPIN in Basel with an international expert panel to hear about the start of the research program, launched on Aug 1st, 2020. Program: intro and overview, the projects E, H, and A, poster…
perspectives

Perspective in EPN: Breaking the Millikelvin Barrier in Nanoelectronics

The fall issue of Europhysics News is featuring the perspectives on "Breaking the Millikelvin Barrier in Nanoelectronics" from Rich Haley, Jonathan Prance (Lancaster) and Dominik Zumbühl (Basel). In labs across Europe physicists are pushing…
Microkelvin

On arXiv: Microkelvin electronics on a pulse-tube cryostat with a gate Coulomb blockade thermometer

Pushing the limits of on-chip temperatures deep into the microkelvin regime would open the door to unprecedented quantum coherence, novel quantum states of matter, and also the discovery of unexpected phenomena. Here, we present a…
QiDiS

Quantum Industry Day in Switzerland 2021 (online)

Today, the Quantum Industry Day Switzerland 2021 took place, with many spin-offs, companies and Universities participating at this online event. There was also a Session on Quantum Computing including trapped ions, superconducting qubits…
summit

Group hike Brisen 2'403 m (Wolfenschiessen NW)

Taking the additional challenge of fog, chilly temperatures and even snow above 2'200 m, the group stayed overnight in the Brisenhaus SAC. On the way up, we were also welcomed by Siubi in his tipi village and Beiz (always open) for a…
Aldo Tarascio has joined the group as PhD student!!

Aldo Tarascio has joined the group as PhD student!!

With a BSc from Roma 3 University and an MSc from the the University of Osaka, Japan, on suspended GaAs quantum well quantum dots in photonic crystal cavities, Aldo Tarascio has started his PhD project in our group. Welcome to the group,…
Rafael Eggli joins groups as PhD student!!

Rafael Eggli has joined the groups as PhD student!!

With a MSc from our group, Rafael Eggli has started his PhD project on developing hole spin qubits in Silicon. Welcome back to the group, and looking forward to work with you!
Pontresina

First meeting of NCCR SPIN in Pontresina

First meeting of NCCR SPIN in Pontresina, Switzerland! For many of us the first in-person meeting in a long time, attendance with covid certificate (recov, vax or tested), 25 talks, ~30 posters with flash competition, hike and evening…
Bajour

Bajour.ch on exclusion from Horizon Europe

The online portal Bajour presents an article on the exlusion of Switzerland from the Horizon Europe Research Program with an interview with Dominik (in German).
Valbella

Retreat Georg H. Endress Cluster in Valbella

Retreat of the Georg H. Endress Cluster in Valbella with talks of the fellows presenting their research, and a hike on Tue afternoon from Alp Scharmoin climbing 1'055 m to Parpaner Rothorn at 2'896 m. Really nice venue and lots of great…
EPN

The European Microkelvin Platform in Europhysics News

The latest (June 2021) issue of the EuroPhysics News features a focus series on Low Temperature Physics with a broad pallette of the many different areas of research, like flavors of ice cream (photo). Christian Enss (Heidelberg), the…
g-factorcontrib

Published in PRL: Isotropic and Anisotropic g-Factor Corrections in GaAs Quantum Dots

The spin splitting defines the energy of the spin qubit and is one of the fundamental properties of a spin in a B-field. Here, we measure and separate the isotropic and anisotropic corrections to the g-factor in two GaAs devices, finding…
ML tuning

On arXiv: Machine Learning Tuning of Silicon and SiGe-based Quantum Devices

Device-to-device variability and disorder in spin qubits makes it currently necessary to individually tune each device in a large-dimensional gate space to find the optimal conditions for qubit operation. We take a key step with a…
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