Ground-state cooling of a nanomechanical resonator coupled to two interacting flux qubits

Keyu Xia*, Jörg Evers

*Corresponding author for this work

    Research output: Contribution to journalArticlepeer-review

    9 Citations (Scopus)

    Abstract

    We discuss cooling of a nanomechanical resonator to its mechanical ground state by coupling it to a collective system of two interacting flux qubits. We find that the collectivity crucially improves cooling by two mechanisms. First, cooling transitions proceed via subradiant Dicke states, and the reduced linewidth of these subradiant states suppresses both the scattering and the environmental contribution to the final phonon number. Second, detrimental carrier excitations without change in the motion of the resonator are suppressed by collective energy shifts.

    Original languageEnglish
    Article number184532
    Pages (from-to)1-6
    Number of pages6
    JournalPhysical Review B: Condensed Matter and Materials Physics
    Volume82
    Issue number18
    DOIs
    Publication statusPublished - 23 Nov 2010

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