Collectivity-assisted ground state cooling of a nanomechanical resonator

Details Collectivity-assisted ground state cooling of a nanomechanical resonator Collectivity-assisted ground state cooling of a nanomechanical resonator

2009-12-10

arxiv.org/abs/0912.1990v1

Physics

Quantum Physics

4 pages, 4 figures

Scientific paper

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 sub-radiant Dicke states, and the reduced line width of these sub-radiant 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.

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