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