17. May 2022

Some recent results in circuit QED with hybrid semiconducting-superconducting nanowires

Datum: 17. May 2022 | 11:00 – 12:00
Sprecher: Bernard van Heck, Leiden University, The Netherlands
Veranstaltungsort: Heinzel Seminar Room / Office Bldg West (I21.EG.101)
Sprache: Englisch

The realization of microwave circuits with hybrid semiconducting-superconducting materials has proven to be an exciting avenue of research, both applied and fundamental. I will discuss two recent developments. In the first, we have detected the gate-tunable kinetic inductance of an InAs/Al nanowire hunting a coplanar waveguide resonator [1]. In the second, we have realized a superconducting qubit whose Josephson energy is determined by a fully controllable quantum dot [2]. This latter circuit can be used as a sensitive detector of the quantum dot parity, and thus to measure parity transitions, resulting in an in-depth experimental study of an Anderson quantum impurity with superconducting leads. I will comment on the significance of these results for our understanding of the underlying material platform, as well as on future directions of research.

[1] L. Splitthoff et al, arXiv:2202.08729.
[2] A. Bargerbos, M. Pita-Vidal et al, arXiv:2202.12754.