Non-classical properties and polarization degree of photon-added entangled nonlinear coherent states Azam Anbaraki, Davood Afshar and Mojtaba Jafarpour Eur. Phys. J. Plus, 133 1 (2018) 2 Published online: 05 January 2018 DOI: 10.1140/epjp/i2018-11833-3