Stationary entanglement between macroscopic mechanical oscillators
  We show that the optomechanical coupling between an optical cavity mode and the two movable cavity end mirrors is able to entangle two different macroscopic oscillation modes of the mirrors. This continuous variable entanglement is maintained by the light bouncing between the mirrors and is robust against thermal noise. In fact, it could be experimentally demonstrated using present technology. 
Stefano Mancini, David Vitali, Vittorio Giovannetti, and Paolo Tombesi