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The Most Coherent Superconducting Qubit?

ORAL

Abstract

Highly anharmonic artificial atoms present a promising approach to gate-based quantum computing. We report our progress in improving coherence and control of fluxonium superconducting circuits with enhancements in fabrication [1]. We demonstrate a device with coherence time T2 exceeding 1 millisecond and an average single qubit gate fidelity greater than 99.99%. Importantly, our circuits are fabricated with robust and scalable methods compatible with existing CMOS manufacturing. This coherence time is still limited by dielectric loss and can be improved further by mitigating material losses. Finally, we discuss the implications of this result on scaling up these devices to quantum processors [2].

[1] Nguyen et al. Phys. Rev. X 9, 041041 (2019)
[2] Ficheux et al. arXiv:2011.02634 (2020)

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Presenters

  • Aaron Somoroff

    University of Maryland, College Park, University of Maryland

Authors

  • Aaron Somoroff

    University of Maryland, College Park, University of Maryland

  • Quentin Ficheux

    University of Maryland, College Park, University of Maryland, Ecole Normale Superieure de Lyon, Univ Lyon, ENS de Lyon, Univ Claude Bernard, CNRS, Laboratoire de Physique,F-69342 Lyon,France

  • Ray Mencia

    University of Maryland, College Park

  • Haonan Xiong

    University of Maryland, College Park

  • Konstantin Nesterov

    University of Wisconsin-Madison, University of Wisconsin - Madison, University of Wisconsin - Madison, Madison, University of Wisconsin, Madison

  • Maxim G Vavilov

    University of Wisconsin-Madison, Department of Physics and Wisconsin Quantum Institute, University of Wisconsin - Madison, University of Wisconsin - Madison, University of Wisconsin - Madison, Madison, Department of Physics, University of Wisconsin-Madison, University of Wisconsin, Madison

  • Vladimir Manucharyan

    University of Maryland, College Park, Department of Physics, University of Maryland, University of Maryland