Ultra-Efficient Cooling of Resonators: Beating Sideband Cooling with Quantum Control. (arXiv:1103.5750v1 [quant-ph])

The present state-of-the-art in cooling mechanical resonators is a version of
“sideband” cooling. Here we present a method that uses the same configuration
as sideband cooling — coupling the resonator to be cooled to a second
microwave (or optical) auxiliary resonator — but will cool significantly
colder. This is achieved by varying the strength of the coupling between the
two resonators over a time on the order of the period of the mechanical
resonator. As part of our analysis, we also obtain a method for fast,
high-fidelity quantum information-transfer between resonators.

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