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Regensburg 2025 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 38: Superconducting Electronics: SQUIDs, Qubits, Circuit QED I

TT 38.1: Vortrag

Mittwoch, 19. März 2025, 16:45–17:00, H32

Microwave characterization of planar Josephson junction arrays — •Alexander Kirchner1, Johanna Berger1, Simon Feyrer1, Narges Momeni1, Matthias Kronseder1, Michael Prager1, Dieter Schuh1, Dominique Bougeard1, Nicola Paradiso1, Christoph Strunk1, and Leandro Tosi2,11Institut für Experimentelle und Angewandte Physik, University of Regensburg, 93040 Regensburg, Germany — 2Centro Atómico Bariloche and Insitituto Balseiro, CNEA, CONICET, San Charlos de Bariloche, Río Negro 8400, Argentina

We present microwave characterization measurements of Josephson junction arrays (JJAs) based on a proximitized Al-InAs quantum well heterostructure. JJAs can be used to achieve high inductances, suitable for the implementation of quantum circuits. They also provide an excellent test-bed for studying the microscopic excitations of hybrid superconductor-semiconductor devices associated to the presence of Andreev states. By probing the low-energy plasmon modes of these devices, we have been able to derive the Josephson inductance and to demonstrate its tunability in out-of-plane magnetic field, following the Fraunhofer diffraction pattern of planar Josephson junctions. Furthermore, the temperature dependence of the inductance provides information about the induced superconducting gap in the two-dimensional electron gas.

Keywords: josephson junction array; quantum circuits; semiconductor/superconductor heterostructure; two-dimensional electron gas; josephson inductance

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