Tradeoff between leakage and dephasing errors in the fluxonium qubit

David A. Herrera-Martí, Ahsan Nazir, Sean D. Barrett

    Research output: Contribution to journalArticlepeer-review


    We present a tradeoff between anharmonicity (related to leakage) and pure dephasing errors for the fluxonium circuit. We show that in the insulating regime, i.e., when the persistent current flowing across the circuit is suppressed, the pure dephasing rate induced by a Markovian environment decreases exponentially as the impedance of the circuit is increased. In contrast to this exponential decrease, the qubit remains sufficiently anharmonic so that gate times can still be short, allowing for significant reduction in the computational error rates. A transition from the insulating to the superconducting phases establishes an upper bound on the Josephson energy below which this tradeoff exists. © 2013 American Physical Society.
    Original languageEnglish
    Article number094512
    JournalPhysical Review B - Condensed Matter and Materials Physics
    Issue number9
    Publication statusPublished - 20 Sept 2013

    Research Beacons, Institutes and Platforms

    • Photon Science Institute


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