Abstract
We have cooled the motion of a radio-frequency nanomechanical resonator by parametric coupling to a driven microwave frequency superconducting resonator and have observed occupation factors as low as <N>= 3.8 +/- 1.3. We expect to find the mechanical resonator in the quantum ground state of motion with probability 0.21. We have also identified three effects which limit further cooling and will comment on the prospect of producing colder states.
© 2009 APS DLS
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