Full characterization and universal control of a superconducting 3D transmon qudit

ORAL

Abstract

While high fidelity single qubit and two-qubit gates have been realized for transmons, use of higher levels as a quantum resource has not yet been systematically studied. Coherent control of these higher energy states offers a direct route to increasing the available quantum volume of a given quantum circuit. In addition, the increasing charge dispersion present in higher level states offers a unique tool for studying charge noise. Here, we use the lowest four levels of a 3D transmon as the quantum register, qudit, which is computational equivalent to two qubits. We measure the decoherence times for each of the excited state. We also demonstrate multiplexing readout and universal control of the qudit with a single drive line.

*This work was performed under the auspices of the U.S. Department of Energy by Lawrence Livermore National Laboratory under Contract DE-AC52-07NA27344. This work was partially supported by the LDRD19-DR-005, the DOE ASCR quantum testbed pathfinder and ASC Beyond Moore’s Law program (LLNL-ABS-795437)

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Presenters

  • Xian Wu

    • National Institute of Standards and Technology Boulder
    • Lawrence Livermore Natl Lab

Authors

  • Xian Wu

    • National Institute of Standards and Technology Boulder
    • Lawrence Livermore Natl Lab

  • Luis Martinez

    • Lawrence Livermore Natl Lab

  • Yaniv J Rosen

    • Lawrence Livermore Natl Lab
    • Lawrence Livermore National Laboratory

  • Jonathan L. DuBois

    • Lawrence Livermore National Laboratory
    • Lawrence Livermore Natl Lab