Print Email Facebook Twitter Evolution of Nanowire Transmon Qubits and Their Coherence in a Magnetic Field Title Evolution of Nanowire Transmon Qubits and Their Coherence in a Magnetic Field Author Lüthi, F. (TU Delft QCD/DiCarlo Lab; TU Delft QuTech; Kavli institute of nanoscience Delft) Stavenga, T. (TU Delft QCD/DiCarlo Lab; TU Delft QuTech; Kavli institute of nanoscience Delft) Enzing, O.W. (Student TU Delft; Kavli institute of nanoscience Delft) Bruno, A. (TU Delft QCD/DiCarlo Lab; TU Delft QuTech; Kavli institute of nanoscience Delft) Dickel, C. (TU Delft QCD/DiCarlo Lab; TU Delft QuTech; Kavli institute of nanoscience Delft) Langford, N.K. (TU Delft QCD/DiCarlo Lab; TU Delft QuTech; Kavli institute of nanoscience Delft) Rol, M.A. (TU Delft QCD/DiCarlo Lab; TU Delft QuTech; Kavli institute of nanoscience Delft) Jespersen, T. S. (University of Copenhagen) Nygård, J. (University of Copenhagen) Krogstrup, P. (University of Copenhagen) DiCarlo, L. (TU Delft QCD/DiCarlo Lab; TU Delft QN/DiCarlo Lab; TU Delft QuTech; Kavli institute of nanoscience Delft) Faculty QuTech Date 2018-03-09 Abstract 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. To reference this document use: http://resolver.tudelft.nl/uuid:25b5e0c1-2149-45f4-9107-6e214613eee4 DOI https://doi.org/10.1103/PhysRevLett.120.100502 ISSN 0031-9007 Source Physical Review Letters, 120 (10) Part of collection Institutional Repository Document type journal article Rights © 2018 F. Lüthi, T. Stavenga, O.W. Enzing, A. Bruno, C. Dickel, N.K. Langford, M.A. Rol, T. S. Jespersen, J. Nygård, P. Krogstrup, L. DiCarlo Files PDF PhysRevLett.120.100502.pdf 2.09 MB Close viewer /islandora/object/uuid:25b5e0c1-2149-45f4-9107-6e214613eee4/datastream/OBJ/view