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Evolution of Nanowire Transmon Qubits and Their Coherence in a Magnetic Field.
Luthi, F; Stavenga, T; Enzing, O W; Bruno, A; Dickel, C; Langford, N K; Rol, M A; Jespersen, T S; Nygård, J; Krogstrup, P; DiCarlo, L.
Afiliação
  • Luthi F; QuTech, Delft University of Technology, Lorentzweg 1, 2628 CJ Delft, Netherlands.
  • Stavenga T; Kavli Institute of Nanoscience, Delft University of Technology, Lorentzweg 1, 2628 CJ Delft, Netherlands.
  • Enzing OW; QuTech, Delft University of Technology, Lorentzweg 1, 2628 CJ Delft, Netherlands.
  • Bruno A; Kavli Institute of Nanoscience, Delft University of Technology, Lorentzweg 1, 2628 CJ Delft, Netherlands.
  • Dickel C; QuTech, Delft University of Technology, Lorentzweg 1, 2628 CJ Delft, Netherlands.
  • Langford NK; Kavli Institute of Nanoscience, Delft University of Technology, Lorentzweg 1, 2628 CJ Delft, Netherlands.
  • Rol MA; QuTech, Delft University of Technology, Lorentzweg 1, 2628 CJ Delft, Netherlands.
  • Jespersen TS; Kavli Institute of Nanoscience, Delft University of Technology, Lorentzweg 1, 2628 CJ Delft, Netherlands.
  • Nygård J; QuTech, Delft University of Technology, Lorentzweg 1, 2628 CJ Delft, Netherlands.
  • Krogstrup P; Kavli Institute of Nanoscience, Delft University of Technology, Lorentzweg 1, 2628 CJ Delft, Netherlands.
  • DiCarlo L; QuTech, Delft University of Technology, Lorentzweg 1, 2628 CJ Delft, Netherlands.
Phys Rev Lett ; 120(10): 100502, 2018 Mar 09.
Article em En | MEDLINE | ID: mdl-29570312
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.

Texto completo: 1 Base de dados: MEDLINE Idioma: En Revista: Phys Rev Lett Ano de publicação: 2018 Tipo de documento: Article País de afiliação: Holanda

Texto completo: 1 Base de dados: MEDLINE Idioma: En Revista: Phys Rev Lett Ano de publicação: 2018 Tipo de documento: Article País de afiliação: Holanda