A route to observing ponderomotive entanglement with optically trapped   mirrors
  The radiation pressure of two detuned laser beams can create a stable trap for a suspended cavity mirror; here it is shown that such a configuration entangles the output light fields via interaction with the mirror. Intra-cavity, the opto-mechanical system can become entangled also. The degree of entanglement is quantified spectrally using the logarithmic negativity. Entanglement survives in the experimentally accessible regime of gram-scale masses subject to thermal noise at room temperature. 
Christopher Wipf, Thomas Corbitt, Yanbei Chen, Nergis Mavalvala