Investigating decoherence in the transmon qubit using a 3D resonator

ORAL

Abstract

We studied the coherence times of transmon qubits using three-dimensional resonators. The three-dimensional (3D) superconducting resonant cavity is machined with aluminum alloy, whose quality factor is higher than 5 million at 10 mK inside a magnetic shield. The transmons are fabricated on sapphire substrates whose internal Q was not lower than 2 million when evaluated in the 3D resonator. We measured the relaxation and dephasing times of the qubits and were able to draw a lower bound on these numbers.

*This work is funded by IARPA.

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Authors

  • Hanhee Paik

    • Yale University

  • D.I. Schuster

    • Yale University

  • L. Bishop

    • Yale University

  • A.P. Sears

    • Yale University

  • G. Kirchmair

    • Yale University

  • Luigi Frunzio

    • Yale University
    • Department of Applied Physics and Physics, Yale University, New Haven, Connecticut 06520, USA

  • Michel Devoret

    • Yale University
    • Departments of Physics and Applied Physics, Yale University, New Haven, CT 06520, USA
    • Applied Physics Department, Yale University

  • Robert J. Schoelkopf

    • Yale University
    • Department of Applied Physics and Physics, Yale University, New Haven, Connecticut 06520, USA