SKM 2021 – scientific programme

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TT: Fachverband Tiefe Temperaturen

TT 7: Focus Session: Disordered and Granular Superconductors: Fundamentals and Applications in Quantum Technology II

TT 7.5: Talk

Tuesday, September 28, 2021, 15:00–15:30, H6

Magnetic-field-compatible hybrid superconducting circuits — •Marta Pita-Vidal — Qutech, Delft university of Technology, The Netherlands

Hybrid superconducting circuits, which integrate semiconducting elements into a circuit quantum electrodynamics (cQED) architecture, provide new insights into mesoscopic superconductivity. Extending the capabilities of hybrid circuits to work in large magnetic fields would enable the investigation and control of spin-polarized and topological phenomena. Here, I will discuss our work on magnetic-field-compatible hybrid cQED devices based on NbTiN. In particular, we exploit the high kinetic inductance of thin NbTiN to build a fluxonium which includes an electrostatically-tuned semiconducting nanowire as its non-linear element. We in-situ tune its Josephson energy with an electrostatic gate and demonstrate operation of the fluxonium in magnetic fields up to 1T. This combination of gate-tunability and field-compatibility demonstrates the utility of hybrid superconducting circuits for exploring mesoscopic physics and enables the use of the fluxonium as a readout device for topological qubits.