SKM 2023 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 20: Superconductivity: Tunnelling and Josephson Junctions
TT 20.1: Vortrag
Dienstag, 28. März 2023, 09:30–09:45, HSZ 103
Calorimetry of a phase slip in a Josephson junction — Efe Gümüs1, Danial Majidi1, Danilo Nikolic2, Patrick Raif2, Bayan Karimi3, Joonas Peltonen3, Elke Scheer2, Jukka Pekola3, Hervé Courtois1, Wolfgang Belzig2, and •Clemens Winkelmann1 — 1Univ. Grenoble Alpes, CNRS, Grenoble INP, Institut Néel, Grenoble, France — 2Fachbereich Physik, Universität Konstanz, Konstanz, Germany — 3Centre of Excellence, Department of Applied Physics, Aalto University School of Science, Aalto, Finland
Josephson junctions are a central element in superconducting quantum technology; in these devices, irreversibility arises from abrupt slips of the quantum phase difference across the junction. This phase slip is often visualized as the tunnelling of a flux quantum in the transverse direction to the superconducting weak link, which produces dissipation. Here we detect the instantaneous heat release caused by a phase slip in a Josephson junction, signalled by an abrupt increase in the local electronic temperature in the weak link and subsequent relaxation back to equilibrium. Beyond the advance in experimental quantum thermodynamics of observing heat in an elementary quantum process, our approach could allow experimentally investigating the ubiquity of dissipation in quantum devices, particularly in superconducting quantum sensors and qubits.