Nonlinearity and nonclassicality in a nanomechanical resonator Berihu Teklu, Alessandro Ferraro, Mauro Paternostro and Matteo G A Paris EPJ Quantum Technol., 2 1 (2015) 16 Published online: 03 July 2015 DOI: 10.1140/epjqt/s40507-015-0029-x