Electrically Configurable Current Flow in Josephson Junctions

ORAL

Abstract

Josephson junctions (JJs) enable dissipation-less current flow in metals and insulators. Unlike bulk superconductors, JJs offer tunable control over the superconducting wavefunction. By varying the SC phase difference between the two sides, the Josephson current across the junction can be modulated periodically, crucial for applications in superconducting quantum bits, parametric amplification, and the exploration of novel quantum excitations. In this work we will demonstrate a universal way to electrically configure the ground state of JJ by varying the bias current within the zero-resistance regime. We will reveal the surprising role of kinetic inductance Lk (inversely related to the superfluid stiffness) and discuss the implications for the Josephson diode effect. Our findings are uncovered by the nanoscale super current flow measurements enabled by a scanning quantum sensing microscope based on nitrogen vacancy centers in diamond.

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Presenters

  • Shaowen Chen

    • Harvard University

Authors

  • Shaowen Chen

    • Harvard University

  • Seunghyun Park

    • Harvard University

  • Uri Vool

    • Harvard University

  • Nikola Maksimovic

    • Harvard University

  • David A Broadway

    • University of Basel

  • Mykhailo Flaks

    • University of Basel

  • Tony Zhou

    • Harvard University

  • Patrick Maletinsky

    • University of Basel

  • Ady L Stern

    • Weizmann Institute of Science

  • Bertrand I Halperin

    • Harvard University

  • Amir Yacoby

    • Harvard University