Entangling movable mirrors in a double-cavity system M. Pinard, A. Dantan, D. Vitali, O. Arcizet, T. Briant and A. Heidmann Europhys. Lett., 72 5 (2005) 747-753 Published online: 03 November 2005 DOI: 10.1209/epl/i2005-10317-6