Enhancement of entanglement in distant micromechanical mirrors using parametric interactionsChang-Sheng Hu, Xi-Rong Huang, Li-Tuo Shen, Zhen-Biao Yang and Huai-Zhi WuEur. Phys. J. D, 71 2 (2017) 24DOI: https://doi.org/10.1140/epjd/e2016-70543-4