Physics of interference of quantum particles

The bra+ket quantum language introduced earlier by the authors for the explanation of quantum correlation at macroscopic distances permit to understand the physical mechanism of the interference of separate quantum particles without the concepts of the transformation of a wave into a particle or vice versa as well as to avoid the assertions of retrocausality, nonlocality, instantaneous interaction or other similar phenomena allegedly inherent to quantum mechanics. Using the bra+ket approach we consider the experiments with two and three slits, the delayed choice experiments and some more complicated interference experiments with changing parameters the results of which caused the vivid many year discussion with adverse conclusions on particle trajectories in the interferometers.