Reducing soft 0-pi qubit cross-capacitance with silicon fin capacitors

ORAL

Abstract

A 0-pi qubit is sought after because it is a charge and phase protected qubit, but has only been experimentally realized in a soft parameter regime, where requirements have been relaxed [1,2,3]. Here, we report on progress implementing high-Q silicon fin capacitors on the soft 0-pi superconducting qubit to improve the millisecond T1 lifetimes, possibly limited by capacitor Q, and dephasing times by reducing cross-capacitances. Through higher capacitance density, the capacitors allow us to reduce capacitance of the light phi (flux) mode, while retaining the heaviness of the theta (charge) mode. This allows us to design a harder 0-pi qubit with decreased sensitivity to charge and phase noise.

[1] A. Kitaev. arXiv:cond-mat/0609441 (2006).

[2] P. Brooks, A. Kitaev, J. Preskill. Phys. Rev. A 87, 052306 (2013).

[3] A. Gyenis, P. Mundada, A. Di Paolo et. al. arXiv:1910.07542 (2019).

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Presenters

  • Pablo Aramburu Sanchez

    University of Colorado Boulder, University of Colorado, Boulder

Authors

  • Pablo Aramburu Sanchez

    University of Colorado Boulder, University of Colorado, Boulder

  • Anthony McFadden

    National Institute of Standards and Technology, Boulder, University of California, Santa Barbara, National Institute of Standards and Technology

  • Tongyu Zhao

    National Institute of Standards and Technology, National Institute of Standards and Technology, Boulder

  • Trevyn Larson

    Duke University

  • Raymond W Simmonds

    National Institute of Standards and Technology, Boulder

  • Andras Gyenis

    CU Boulder, University of Colorado Boulder, University of Colorado, Boulder