Non-Hermitian shortcut to adiabaticity of two- and three-level systems with gain and loss Guan-Qiang Li, Guang-De Chen, Ping Peng and Wei Qi Eur. Phys. J. D, 71 1 (2017) 14 Published online: 19 January 2017 DOI: 10.1140/epjd/e2016-70525-6