Mesoscopic Josephson junctions

Mesoscopic Josephson junctions are the central building block for superconducting quantum devices. Their functionality is used to unlock a wide range of quantum technologies, from sensing the smallest signals in nature, down to the fundamental quantum limits, to generating large scale quantum coherent states in circuit chips for quantum information processing.

Our group tackles some of the most challenging open problems in mesoscopic Josephson junctions by studying their functionality together with the properties of the electromagnetic environment present in the real circumstances of the laboratory. Together with world-leading experimental collaborators at the Max Plank Institute for Solid State Research in Stuttgart we have successfully advanced the current understanding of transport in tunneling superconducting junctions operated at milliKelvin temperatures, the Josephson effect in atomic superconducting contacts, and the superconducting tunneling between Yu-Shiba-Rusinov resonances localized by single-atom impurities.

Artist's View of a tunneling process in a Scanning Tunneling Microscope (STM) (c) MPIFKF Stuttgart

Related Work

Senkpiel, Jacob; Dambach, Simon; Etzkorn, Markus; Drost, Robert; Padurariu, Ciprian; Kubala, Björn; Belzig, Wolfgang; Yeyati, Alfredo Levy; Cuevas, Juan Carlos; Ankerhold, Joachim; Ast, Christian R.; Kern, Klaus
Single Channel Josephson Effect in a High Transmission Atomic Contact
Jäck, Berthold; Senkpiel, Jacob; Etzkorn, Markus; Ankerhold, Joachim; Ast, Christian R.; Kern, Klaus
Signatures of phase-coherent transport and the role of quantum fluctuations in the dynamical Coulomb blockade regime
Jäck, Berthold; Senkpiel, Jacob; Etzkorn, Markus; Ankerhold, Joachim; Ast, Christian R.; Kern, Klaus
Quantum Brownian Motion at Strong Dissipation Probed by Superconducting Tunnel Junctions
Phys. Rev. Lett., 119:147702
Ast, Christian R.; Jäck, Berthold; Senkpiel, Jacob; Eltschka, Matthias; Etzkorn, Markus; Ankerhold, Joachim; Kern, Klaus
Sensing the quantum limit in scanning tunnelling spectroscopy
Nature Communications, 7
October 2016
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Institute for complex quantum systems

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DirectorProf. Dr. Joachim Ankerhold