Bulletin of the American Physical Society
APS March Meeting 2023
Volume 68, Number 3
Las Vegas, Nevada (March 5-10)
Virtual (March 20-22); Time Zone: Pacific Time
Session M27: Superconductivity:JJ-II
8:00 AM–11:00 AM,
Wednesday, March 8, 2023
Room: Room 219
Sponsoring
Unit:
DCMP
Chair: Timothy Benseman, Queens College, City University of New York
Abstract: M27.00014 : Quantum coherence of Josephson vortices in high impedance long junctions
10:36 AM–10:48 AM
Presenter:
Micha Wildermuth
(Karlsruhe Institute of Technology)
Authors:
Micha Wildermuth
(Karlsruhe Institute of Technology)
Jan Nicolas Voss
(Karlsruhe Institute of Technology)
Maximilian Kristen
(Karlsruhe Institute of Technology)
Andre Schneider
(Karlsruhe Institute of Technology)
Mikhail V. Fistoul
(Ruhr-Universität Bochum)
Hannes Rotzinger
(Karlsruhe Institute of Technology)
Alexey V Ustinov
(Karlsruhe Institute of Technology)
With the advent of high kinetic inductance circuits, relaxed constrains for quantum Josephson vortices are at reach.
In our experiment we propose a coupled long Josephson junction-resonator system and determine the quantum states of various inherent vortex configurations with a dispersive readout scheme. The experimentally observed energy spectrum is compared with theoretical predictions of a single coherently tunneling vortex. We find signatures of a quantum two-level system and present measured coherence and relaxation times.
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