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Superconducting materials as building blocks for circuit quantum electrodynamics.

Date: 2023-12-12
Time: 10:30
Venue: M53
Speaker: Professor Joris Van de Vondel

Quantum Solid- State Physics, Department of Physics and Astronomy, KU Leuven

Celestijnenlaan 200D, Leuven, B-3001, Belgium


Qubit technology based on superconducting materials is among the leading approaches to real-world quantum computing applications reaching coherence times of tens of microseconds, gate times of tens of nanoseconds, and readout times of hundreds of nanoseconds, while working at tens of milliKelvins. I will introduce the different challenges, related to nano- and micro-fabrication, which need to be tackled in order to  obtain the envisioned device performance.

As a specific example, I will discuss the fabrication and characterization of different, high quality, superconducting resonators. In order to achieve this goal, we developed the experimental capabilities to perform circuit quantum electrodynamics in a very broad frequency range at cryogenic temperatures. The developed infrastructure, combined with high quality nanofabrication, enables a detailed spectroscopic investigation of various qubit systems and pave the road for novel superconducting based devices. In this framework, I will discuss the implementation of an “unconventional” junction type, i.e. superconducting nanowires [1], embedded in a superconducting loop, as a possible phase-slip qubit [2].


1. H. Dausy, L. Nulens, B. Raes, M. J. Van Bael, and J. Van de Vondel, Phys. Rev. Appl. 16, 024013 (2021)

2. J. E. Mooij and Yu. V. Nazarov, Nature Physics 2, 169 (2006).

Short CV – Joris Van de Vondel (JVdV) obtained his PhD degree from KU Leuven in 2007 in the group of Prof. Moshchalkov, who is a pioneer in the investigation of superconductivity at the nanoscale.  In 2010, he moved to the group of Prof. S.O. Valenzuela (Universitat Autonoma de Barcelona) to work on spin transport in graphene-based structures. In this group, he initiated research on graphene-based spintronics and obtained the first results on the fabrication and characterization of high quality non-local spin valves.  At the end of 2011, he obtained a tenure track position at the KUL, which gave him the opportunity to start his own research group.  His research group (team of 7 PhD students) established an in-depth expertise regarding nanofabrication and a variety of low-temperature measurements.

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