Sideband cooling of micromechanical motion to the quantum ground state. - Teufel, J. D.; Donner, T.; Li, Dale; arlow, J. W.; Allman, M. S.; Cicak, K.; Sirois, A. J.; Whittaker, J. D.; Lehnert, K. W.; Simmonds, R. W. (Nature, 2011)