Decoherence in Improved Transmon Qubits

ORAL

Abstract

The transmon is a simple superconducting qubit which has less dependence on the usual sources of 1/f noise, and has coherence which is mostly limited by a source of anomalous dissipation. The quality factors of transmon qubits on sapphire are observed to be $\sim$ 50,000, similar to that of transmission line resonators made with the same geometry. It is likely that both these devices may be limited by surface dielectric losses. We will report on the design and characterization of transmon qubits which are fabricated with reduced dielectric losses to possibly increase coherence times.

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Authors

  • A.P. Sears

    Yale University

  • Hanhee Paik

    Yale University

  • D.I. Schuster

    Yale University

  • L. Bishop

    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