Fluxonium Qubit Systems for Coherent Quantum Annealing

ORAL

Abstract

Fluxonium systems are perfect candidates for coherent quantum annealing. Individual fluxonium qubits have: (i) substantially long coherence time in excess 5 μs away from sweet spot and 100 μs at the half-flux sweet spot[1], (ii) strong X-X qubit coupling, which can be made to exceed the qubit transition energy[2], and (iii) two low-energy states, well separated from higher-energy states. These characteristics are expected enable long-coherence annealing protocols, whilekeeping the system in the computational subspace. A potential resource for quantum speed up is multiqubit tunneling in hard optimization problems [3]. In this talk, we describe the multiqubit tunneling in the system of strongly coupled fluxonium qubits during annealing. We discuss the effect of flux noise and dielectric losses on the multiqubit tunneling events.

[1] Nguyen et al, arXiv:1810.11006 (2018).
[2] Kou et al., Phys. Rev. X 7, 031037 (2017).
[3] S. Boixo et al, Nat. Commun. 7, 10327 (2016).

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Presenters

  • Maxim Vavilov

    • University of Wisconsin - Madison
    • Department of Physics, University of Wisconsin - Madison
    • University of Wisconsin, Madison
    • Physics, University of Wisconsin - Madison
    • Department of Physics, University of Wisconsin - Madison, Madison, WI 53706
    • University of Wisconsin-Madison

Authors

  • Maxim Vavilov

    • University of Wisconsin - Madison
    • Department of Physics, University of Wisconsin - Madison
    • University of Wisconsin, Madison
    • Physics, University of Wisconsin - Madison
    • Department of Physics, University of Wisconsin - Madison, Madison, WI 53706
    • University of Wisconsin-Madison

  • Zhenyi Qi

    • USRA Research Institute for Advanced Computer Science
    • Department of Physics, University of Wisconsin - Madison, Madison, WI 53706
    • University of Wisconsin - Madison

  • Mark Dykman

    • Department of Physics and Astronomy, Michigan State University
    • Department of Physics and Astronomy, Michigan State University, East Lansing, MI 48824

  • Vladimir Manucharyan

    • Department of Physics, University of Maryland
    • University of Maryland, College Park
    • University of Maryland-College Park
    • Physics, University of Maryland, College Park
    • Department of Physics, University of Maryland, College Park, MD 20742
    • University of Maryland - College Park