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Quantum Tunneling of Josephson Vortices in High-Impedance Long Junctions

Wildermuth, Matthias Micha ORCID iD icon 1
1 Physikalisches Institut (PHI), Karlsruher Institut für Technologie (KIT)

Abstract:

In the last decades, superconducting devices have emerged as a promising platform for quantum technologies, including quantum sensing and quantum computing. Their key elements are Josephson junctions, which allow for coherent supercurrent tunneling between two weakly linked superconductors. If such a junction is extended in one direction to a long junction, the superconducting phase difference can vary in space and time and may allow for quantized phase windings that drive supercurrent vortices. The physics of such Josephson vortices spans from nonlinear soliton dynamics with relativistic effects to technical applications like microwave generation and amplification. In all these cases the vortices behave as non-quantum particles. This restriction to classical behavior originates in the long junction's limited geometrical properties, in particular its electrode inductance.
The advent of superconducting high-kinetic inductance circuits relaxes these constraints and enables an increased junction impedance, which goes along with the vortices' quantumness. In this work it is demonstrated that the junction impedance can be enhanced beyond the geometric limitations, which facilitates various applications. ... mehr


Volltext §
DOI: 10.5445/IR/1000158804
Veröffentlicht am 19.05.2023
Cover der Publikation
Zugehörige Institution(en) am KIT Institut für Theorie der Kondensierten Materie (TKM)
Physikalisches Institut (PHI)
Publikationstyp Hochschulschrift
Publikationsdatum 19.05.2023
Sprache Englisch
Identifikator KITopen-ID: 1000158804
Verlag Karlsruher Institut für Technologie (KIT)
Umfang viii, 144 S.
Art der Arbeit Dissertation
Fakultät Fakultät für Physik (PHYSIK)
Institut Physikalisches Institut (PHI)
Prüfungsdatum 22.07.2022
Schlagwörter Josephson effect, Long Josephson junction, Josephson vortex, Fluxon, Qubit, Quantum bit
Relationen in KITopen
Referent/Betreuer Ustinov, Alexey V.
Shnirman, Alexander G.
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