Regensburg 2022 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 26: Superconductivity: Tunnelling and Josephson Junctions

TT 26.1: Vortrag

Donnerstag, 8. September 2022, 09:30–09:45, H10

Microwave spectroscopy of a long Josephson junction strongly coupled to a resonator — •Micha Wildermuth¹, Mikhail Fistul², Jan Nicolas Voss¹, Andre Schneider¹, Hannes Rotzinger^{1, 3}, and Alexey V. Ustinov^{1, 3} — ¹Institute of Physics, Karlsruhe Institute of Technology, 76131 Karlsruhe, Germany — ²Theoretische Physik III, Ruhr-Universität Bochum, 44801 Bochum Germany — ³Institute for Quantum Materials and Technology, Karlsruhe Institute of Technology, 76131 Karlsruhe, Germany

Long Josephson junctions are interesting physical systems due to their strongly nonlinear spatial and temporal dynamics. In the past, most of experiments were performed by coupling long junctions galvanically to measurement lines and recording their DC current-voltage characteristics. Here we explore an alternative approach, where the long junction is attached to a passive microwave resonator and the whole coupled system is measured with an RF technique. This configuration opens up new opportunities of low-dissipative tests and applications, in particular, for Josephson vortex qubits. We present fabrication results, microwave spectroscopy data and numerical simulations of this high-impedance hybrid system.