Enhancement of entanglement in distant micromechanical mirrors using parametric interactions Chang-Sheng Hu, Xi-Rong Huang, Li-Tuo Shen, Zhen-Biao Yang and Huai-Zhi Wu Eur. Phys. J. D, 71 2 (2017) 24 Published online: 07 February 2017 DOI: 10.1140/epjd/e2016-70543-4