4.8 Article

Evolution of Nanowire Transmon Qubits and Their Coherence in a Magnetic Field

期刊

PHYSICAL REVIEW LETTERS
卷 120, 期 10, 页码 -

出版社

AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.120.100502

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资金

  1. Microsoft Corporation Station Q
  2. Dutch organization for Fundamental Research on Matter (FOM)
  3. Netherlands Organization for Scientific Research via the Frontiers of Nanoscience program (NWO)/Dutch Ministry of Education, Culture and Research (OCW)
  4. European Research Council (ERC) Synergy grant
  5. Danish National Research Foundation

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We present an experimental study of flux- and gate-tunable nanowire transmons with state-of-the-art relaxation time allowing quantitative extraction of flux and charge noise coupling to the Josephson energy. We evidence coherence sweet spots for charge, tuned by voltage on a proximal side gate, where first order sensitivity to switching two-level systems and background 1 / f noise is minimized. Next, we investigate the evolution of a nanowire transmon in a parallel magnetic field up to 70 mT, the upper bound set by the closing of the induced gap. Several features observed in the field dependence of qubit energy relaxation and dephasing times are not fully understood. Using nanowires with a thinner, partially covering Al shell will enable operation of these circuits up to 0.5 T, a regime relevant for topological quantum computation and other applications.

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