Correlating decoherence in transmon qubits: Low frequency noise by single fluctuators

ORAL

Abstract

We report on long-term measurements of a high-coherent, non-tunable transmon qubit, revealing low frequency burst noise in coherence and transition frequency. We present a simultaneous measurement of the qubit's relaxation and dephasing rates as well as resonance frequency fluctuations, and analyze their correlations. These yield information about the microscopic origin of the intrinsic decoherence mechanisms in Josephson qubits and their fluctuation dynamics. From a spectral noise analysis we obtain further evidence for our presented model of a small number of dominant fluctuators.

*This work is supported by Deutsche Forschungsgemeinschaft (DFG) within Project INST 121384/138-1 FUGG and by the European Research Council (ERC) under the Grant Agreement 648011. We acknowledge financial support by the Helmholtz International Research School for Teratronics.

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Presenters

  • Steffen Schlör

    • Institute of Physics, Karlsruhe Institute of Technology

Authors

  • Steffen Schlör

    • Institute of Physics, Karlsruhe Institute of Technology

  • Jürgen Lisenfeld

    • Institute of Physics, Karlsruhe Institute of Technology
    • Physikalisches Institut, Karlsruhe Institute of Technology

  • Clemens Müller

    • Institute for Theoretical Physics, ETH Zürich

  • Andre Schneider

    • Institute of Physics, Karlsruhe Institute of Technology

  • Alexey Ustinov

    • Karlsruhe Institute of Technology
    • Institute of Physics, Karlsruhe Institute of Technology

  • Martin Weides

    • School of Engineering, University of Glasgow
    • University of Glasgow