Double-slit experiment and Bogoliubov’s causality principle

In the Bogoliubov approach the causality principle is the basic constructive element of quantum field theory. At the same time, this principle has obvious classical interpretation. On the other hand, it is well-known Feynman statement that the double-slit experiment is “impossible, absolutely impossible to explain in classical way, and has in it the heart of quantum mechanics. We describe how taking into account of infrared singularities allows to give quite evident interpretation to double-slit experiment. And this interpretation agrees with the Bogoliubov’s causality principle.