Microwave probing of flux-tunable topological insulator-based Josephson quantum circuits

ORAL

Abstract

Topological superconductivity and Majorana zero modes (MZMs) are predicted to emerge in hybrid devices comprising s-wave superconductors (S) and topological insulators (TIs). Signatures of MZMs include zero-bias conductance peaks in tunnelling spectroscopy of vortex cores and the fractional Josephson effect in S-TI-S Josephson junctions. Here we explore how S-TI-S junctions integrated with superconducting microwave circuits can be used to detect MZMs in the microwave absorption spectrum probed using circuit quantum electrodynamics (cQED). We perform tight-binding simulations to study how the energy-phase relation of MZMs impacts the cQED response of flux-tuneable circuits and report the latest experimental progress towards realising such devices using V-VI semiconductor (BixSb1-x)2Te3 topological insulators.

*Grant No. 13N15264EPSRC EP/L020963/1

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Presenters

  • Chenlu Liu

    • Imperial College London

Authors

  • Chenlu Liu

    • Imperial College London

  • Tobias W Schmitt

    • Forschungszentrum Jülich and RWTH Aachen University

  • Michael Schleenvoigt

    • Forschungszentrum Jülich and RWTH Aachen University
    • Forschungszentrum Jülich

  • Oscar W Kennedy

    • Imperial College London

  • Chi Zhang

    • Imperial College London

  • Hoe R Tiew

    • Imperial College London

  • Kristof Moors

    • Forschungszentrum Jülich
    • Forschungszentrum Jülich and RWTH Aachen University

  • Abdur Rehman Jalil

    • Forschungszentrum Jülich and RWTH Aachen University

  • Benjamin Bennemann

    • Forschungszentrum Jülich and RWTH Aachen University

  • Stefan Trellenkamp

    • Helmholtz Nano Facility (HNF), Forschungszentrum Juelich
    • Forschungszentrum Jülich and RWTH Aachen University

  • Florian Lentz

    • Forschungszentrum Jülich

  • Elmar Neumann

    • Forschungszentrum Jülich

  • Gregor Mussler

    • Forschungszentrum Jülich and RWTH Aachen University

  • Detlev Grützmacher

    • Forschungszentrum Jülich and RWTH Aachen University

  • Peter Schüffelgen

    • Forschungszentrum Jülich
    • Forschungszentrum Jülich and RWTH Aachen University

  • Malcolm R Connolly

    • Imperial College London