Designing high-impedance/low-noise superinductances for quantum electronics

ORAL

Abstract

Superinductances are essential circuit elements which enable the suppression of charge fluctuations in superconducting fluxonium qubits [1] and in other Josephson junction devices [2]. Commonly implemented as an array of Josephson junctions, superinductances have two main limitations. Firstly, the spurious capacitive coupling of the chain islands to ground lowers the plasma frequency of the chain, and consequently limits the operational bandwidth. Secondly, coherent quantum phase-slips (CQPS) [3] in the Josephson junction chain induce time dependent inductance fluctuations via the Aharonov-Casher effect [4]. We present the application of a novel lithographic technique [5] which enables the fabrication of arrays with optimal junction-capacitance to ground-capacitance ratio. We also present new superinductance designs which topologically suppress the CQPS, allowing the implementation of practically phase-slip free high inductance Josephson junction.\\[4pt] [1] Manucharyan et al., Science, 326 (2009)\\[0pt] [2] Guichard and Hekking, PRB, 81 (2010)\\[0pt] [3] Matveev et al. PRL, 89 (2002)\\[0pt] [4] Pop et al., arXiv:1105.6204 and Manucharyan et al., arXiv:1012.1928\\[0pt] [5] Lecocq et al., Nanotechnology, 22 (2011)

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Authors

  • Ioan Pop

    Yale University, Applied Physics, Yale University, Yale University, QLAB

  • Zlatko Minev

    Yale University, Applied Physics, Yale University, Yale University, QLAB

  • N.A. Masluk

    Yale University, Applied Physics, Yale University

  • Archana Kamal

    Yale University, Applied Physics, Yale University, Departments of Physics and Applied Physics, Yale University, Applied Physics - Yale University

  • Michel Devoret

    Yale University, Applied Physics, Yale University, Applied Physics Department Yale University, Department of Applied Physics, Yale University, Departments of Physics and Applied Physics, Yale University, Applied Physics - Yale University, Yale University, Dept. of Applied Physics, Applied Physics Dept. Yale University