Ground state cooling of a nanomechanical resonator in the weak-confinement regime via quantum interference

Details Ground state cooling of a nanomechanical resonator in the weak-confinement regime via quantum interference Ground state cooling of a nanomechanical resonator in the weak-confinement regime via quantum interference

2009-02-23

arxiv.org/abs/0902.3939v2

Phys. Rev. Lett. 103, 227203 (2009)

Physics

Quantum Physics

Scientific paper

Ground state cooling of a nanomechanical resonator coupled to a superconducting flux qubit is discussed. We show that by inducing quantum interference to cancel detrimental carrier excitations, ground state cooling becomes possible in the weak-confinement or non-resolved regime. The qubit is modelled as a three-level system in lambda configuration, and the driving fluxes are applied such that the qubit absorption spectrum exhibits electromagnetically induced transparency, thereby cancelling the unwanted carrier excitation. As our interference-based scheme allows to apply strong cooling fields, fast and efficient cooling can be achieved.

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