Raman Transitions in a Capacitively shunted Fluxonium Circuit

ORAL

Abstract

Superconducting qubits are a promising technology for quantum information processing, but still require improvements in coherence times for fault tolerant quantum computation. One promising path to enhance lifetimes is to engineer a circuit with suppressed transition matrix elements between the qubit states, increasing robustness to environmental noise. We realize this suppression by adding a capacitive shunt to a fluxonium circuit, obtaining lifetimes up to 8\,ms. The reduced transition matrix elements, however, make direct coherent operations a challenge. We overcome this challenge using a three-photon Raman scheme in a $\Lambda$ system realized in the circuit, demonstrating a 500$\times$ decrease in gate times. We will also discuss ongoing research in development of qubits that are protected from both decay and dephasing.

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Presenters

  • Nathan Earnest

    Univ of Chicago, James Franck Institute and Department of Physics, University of Chicago, James Franck Institute, University of Chicago, Physics, University of Chicago

Authors

  • Nathan Earnest

    Univ of Chicago, James Franck Institute and Department of Physics, University of Chicago, James Franck Institute, University of Chicago, Physics, University of Chicago

  • Srivatsan Chakram

    Univ of Chicago, James Franck Institute and Department of Physics, University of Chicago, James Franck Institute, University of Chicago, Physics, University of Chicago

  • Yao Lu

    James Franck Institute and Department of Physics, University of Chicago, University of Chicago, Univ of Chicago, James Franck Institute, University of Chicago, Physics, University of Chicago

  • Nicholas Irons

    Physics, Northwestern University

  • Ravi Naik

    University of Chicago, Univ of Chicago, James Franck Institute and Department of Physics, University of Chicago, Physics, University of Chicago

  • Nelson Leung

    University of Chicago, Univ of Chicago, James Franck Institute, University of Chicago

  • Leonidas Ocola

    Argonne National Lab

  • David Czaplewski

    Argonne National Lab

  • Brian Baker

    Physics, Northwestern University

  • Walter Lawrence

    Dartmouth

  • Jens Koch

    Northwestern Univeristy, Department of Physics and Astronomy, Northwestern University, Department of Physics and Astronomy, Northwestern Univ, Department of Physics & Astronomy, Northwestern University, Northwestern University, Physics, Northwestern University

  • David Schuster

    Univ of Chicago, Physics, Univ of Chicago, James Franck Institute and Department of Physics, University of Chicago, University of Chciago, Physics, University of Chicago, Institute for Molecular Engineering, University of Chicago, University of Chicago, James Franck Institute, University of Chicago