Cover：The robust quantum coherence and high controllability of Bose condensed atoms have led to many exciting advances in the field of quantum interferometry. Due to the atom-atom collisions, the systems of Bose condensed atoms are intrinsic nonlinear systems. In general, inter-particle interactions can be used to generate quantum entanglement and quantum entanglement can be utilized to enhance measurement precision. Therefore, it is important to control and exploit the nonlinear dynamics of Bose condensed atoms for the implementation of quantum metrology. The cover picture shows the matter-wave interference of repulsive atomic Bose-Einstein condensates in a one-dimensional harmonic trap, in which dark solitons are gradually generated. More details could be found in the review article “Nonlinear quantum interferometry with Bose condensed atoms” by Chaohong Lee et al., pp 109－130. [Photo credits: Chaohong Lee, School of Physics and Engineering, Sun Yat-Sen University, China]
