Coherent control and feedback cooling in a remotely-coupled hybrid   atom-optomechanical system
  Cooling to the motional ground state is an important first step in the preparation of nonclassical states of mesoscopic mechanical oscillators. Light-mediated coupling to a remote atomic ensemble has been proposed as a method to reach the ground state for low frequency oscillators. The ground state can also be reached using optical measurement followed by feedback control. Here we investigate the possibility of enhanced cooling by combining these two approaches. The combination, in general, outperforms either individual technique, though atomic ensemble-based cooling and feedback cooling each individually dominate over large regions of parameter space. 
James S. Bennett, Lars S. Madsen, Mark Baker, Halina   Rubinsztein-Dunlop and Warwick P Bowen
quant-ph