Ion trap transducers for quantum electromechanical oscillators
  An enduring challenge for contemporary physics is to experimentally observe and control quantum behavior in macroscopic systems. We show that a single trapped atomic ion could be used to probe the quantum nature of a mesoscopic mechanical oscillator precooled to 4K, and furthermore, to cool the oscillator with high efficiency to its quantum ground state. The proposed experiment could be performed using currently available technology. 
W.K. Hensinger, D.W. Utami, H.-S. Goan, K. Schwab, C. Monroe, and G.J.   Milburn