Fast controlled preparation of two-atom maximally entangled state and N-atom W state in the direct coupled cavity systems via shortcuts to adiabatic passageZhe Wang, Yan Xia, Ye-Hong Chen and Jie SongEur. Phys. J. D, 70 8 (2016) 162DOI: https://doi.org/10.1140/epjd/e2016-60638-3