Dynamics and manipulation of a trapped, superconducting quasiparticle: Part 1/2

ORAL

Abstract

The physics of conventional and exotic superconductors can be probed through their microscopic quasiparticle excitations. Recent advances in mesoscopic superconductor-semiconductor devices have created the opportunity to measure and control such excitations, such as Majorana zero modes in a topological superconductor regime. Here, our mesoscopic device is a Josephson element with an InAs nanowire weak link. Due to spin-orbit coupling in the nanowire, the spin states of a single quasiparticle trapped in the junction’s Andreev levels exhibit microwave-accessible energy splittings without an applied magnetic (Zeeman) field. This “superconducting spin” is readily coupled to a microwave resonator via its spin-dependent supercurrent. We will present our experimental platform demonstrating large spin-dependent dispersive shifts of a microwave resonator. We achieve single-shot, quantum-non-demolition readout of the spin as well as coherent manipulation of the quasiparticle state. We will discuss the real-time dynamics of the quasiparticle, which have implications for Majorana devices and Andreev spin qubits. In this first part of a joint presentation, we will present the background, experimental setup, and a theoretical model for our system.

*Work supported by: ARO, ONR, NSF, and AFOSR.

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Presenters

  • Valla Fatemi

    • Yale University
    • Department of Applied Physics, Yale University
    • Applied Physics, Yale University

Authors

  • Valla Fatemi

    • Yale University
    • Department of Applied Physics, Yale University
    • Applied Physics, Yale University

  • Max Hays

    • Yale University
    • Department of Applied Physics, Yale University
    • Applied Physics, Yale University

  • Daniël Bouman

    • QuTech and Kavli Institute of Nanoscience, Delft University of Technology

  • Kyle Serniak

    • MIT Lincoln Lab
    • Yale University
    • MIT Lincoln Laboratory
    • Applied Physics, Yale University

  • Spencer Diamond

    • Yale University
    • Department of Applied Physics, Yale University
    • Applied Physics, Yale University

  • Tom Connolly

    • Applied Physics, Yale University

  • Gijs De Lange

    • Microsoft Quantum Lab Delft, 2628 CJ, Delft, The Netherlands
    • Quantum Lab Delft, Microsoft
    • Applied Physics, Yale University
    • QuTech and Kavli Institute of Nanoscience, Delft University of Technology
    • Microsoft Corp

  • Peter Krogstrup

    • Niels Bohr Institute, University of Copenhagen
    • University of Copenhagen
    • Center for Quantum Devices and Microsoft Quantum Lab--Copenhagen, Niels Bohr Institute, University of Copenhagen
    • Center for Quantum Devices, Niels Bohr Institute, University of Copenhagen

  • Jesper Nygård

    • Center for Quantum Devices, Niels Bohr Institute, University of Copenhagen
    • Center for Quantum Devices, University of Copenhagen

  • Attila Geresdi

    • QuTech and Kavli Institute of Nanoscience, Delft University of Technology
    • Department of Microtechnology and Nanoscience, Chalmers University of Technology

  • Michel H. Devoret

    • Yale University
    • Department of Applied Physics, Yale University
    • Applied Physics, Yale University