Regensburg 2022 – scientific programme
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TT: Fachverband Tiefe Temperaturen
TT 37: Superconducting Electronics: SQUIDs, Qubits, Circuit QED
TT 37.5: Talk
Friday, September 9, 2022, 10:30–10:45, H22
Gate-tunable kinetic inductance in proximitized nanowires — •Lukas Johannes Splitthoff1, Arno Bargerbos1, Lukas Grünhaupt1, Marta Pita-Vidal1, Jaap Joachim Wesdorp1, Yu Liu2, Angela Kou3, Christian Kraglund Andersen1, and Bernard van Heck4 — 1Delft University of Technology, Delft University of Technology, Delft, The Netherlands — 2Center for Quantum Devices, Niels Bohr Institute, University of Copenhagen, Copenhagen, Denmark — 3Department of Physics and Frederick Seitz Materials Research Laboratory, University of Illinois Urbana-Champaign, Urbana, USA — 4Leiden Institute of Physics, Leiden University, Leiden, The Netherlands
Superconducting-semiconducting nanowires combine two frontiers of condensed matter in a hybrid state, which offers formidable possibilities for quantum computing and quantum sensing devices. In this talk, we study a quarter-wave coplanar waveguide resonator shunted by a hybrid InAs/Al nanowire. We show a gate voltage controllable resonance frequency and demonstrate a frequency shift of up to 8MHz. We relate the frequency shift to the change in kinetic inductance of the hybrid nanowire which arises from the gate-tunable hybridization of the superconductor to semiconductor interface. From our measurement results we extract the normal state conductivity and the superconducting gap of the hybrid nanowire. The measurement technique demonstrated in this work complements existing characterization methods for hybrid nanowires and forms a promising path towards gate-controlled superconducting electronics.