Two-Qubit Gates with Fluxonium Circuits.

ORAL

Abstract

Among superconducting qubits, the fluxonium offers a unique advantage of the possibility to use different transitions for memory storage and gate realizations [1]. In this talk, we discuss various ways to make entangling gates between fluxoniums using noncomputational levels of the two-qubit system. In one example, a controlled-Z gate is activated by driving a transition leading out of the computational subspace while two qubits are kept at fixed frequencies at their sweet spots [2]. The second example is based on adiabatic tuning of one or both of the qubits away from their sweet spots towards the avoided level crossing between a computational and noncompuational levels [3]. One more possible gate is mediated through a common resonator mode. We compare all the techniques and discuss their advantages and limitations.

[1] L. B. Nguyen, et. al., arXiv:1810.11006 (2018).
[2] K. N. Nesterov, et. al., Phys. Rev. A 98, 030301 (2018).
[3] L. DiCarlo, et. al., Nature (London) 460, 240 (2009).

*We acknowledge funding from the U.S. Army Research Office (Grant No. W911NF-18-1-0146).

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Presenters

  • Yinqi Chen

    • University of Wisconsin - Madison

Authors

  • Yinqi Chen

    • University of Wisconsin - Madison

  • Konstantin Nesterov

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

  • Ivan Pechenezhskiy

    • University of Maryland, College Park
    • University of Maryland-College Park
    • University of Maryland - College Park

  • Zhenyi Qi

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

  • Long Nguyen

    • University of Maryland, College Park
    • University of Maryland-College Park
    • University of Maryland - College Park

  • Yen-Hsiang Lin

    • University of Maryland, College Park
    • University of Maryland-College Park
    • University of Maryland - College Park

  • Aaron Somoroff

    • University of Maryland, College Park
    • University of Maryland-College Park
    • Physics, City College of City University of New York
    • University of Maryland - College Park

  • Ray Mencia

    • University of Maryland, College Park
    • University of Maryland-College Park
    • University of Maryland - College Park

  • 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

  • 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