Topological Josephson effect in gate-tunable qubit devices

ORAL

Abstract

Gate-tunable superconducting qubits that host Majorana zero modes realize an intermediate step to topologically protected qubits by storing the quantum state in topological degrees of freedom. In this talk I will present numerical simulations of such devices that combine superconducting proximity effect, orbital effects, electrostatic environment and realistic geometry. I will show the phase diagram and the key properties of these topological Josephson junctions, in particular the Josephson energy and Majorana coupling energy. Based on these I identify regimes of the surrounding electrostatic environment most favorable for realizing qubits and relate this to observable experimental features.

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Presenters

  • Andrey Antipov

    • Microsoft Corp

Authors

  • Andrey Antipov

    • Microsoft Corp

  • Cameron King

    • Microsoft Corp

  • Kewei Li

    • Microsoft Corp

  • John Gamble

    • Microsoft Corp

  • Bela Bauer

    • Station Q, Microsoft Quantum
    • Microsoft Corp
    • Microsoft

  • Georg Winkler

    • Microsoft Corp
    • Microsoft Quantum, Microsoft Station Q, University of California Santa Barbara, Santa Barbara, CA 93106, USA

  • Roman Lutchyn

    • Microsoft Quantum, Santa Barbara, CA, USA
    • Microsoft Corp
    • University of California, Santa Barbara
    • Microsoft Quantum, Microsoft Station Q, University of California Santa Barbara, Santa Barbara, CA 93106, USA
    • Station Q, Microsoft Research, Santa Barbara, California 93106-6105, USA