  We present a fully local treatment of the double slit experiment in the
formalism of quantum field theory. Our exposition is predominantly pedagogical
in nature and exemplifies the fact that there is an entirely local description
of the quantum double slit interference that does not suffer from any supposed
paradoxes usually related to the wave-particle duality. The wave-particle
duality indeed vanishes in favour of the field picture in which particles
should not be regarded as the primary elements of reality and only represent
excitations of some specific field configurations. Our treatment is general and
can be applied to any other phenomenon involving quantum interference of any
bosonic or fermionic field, both spatially and temporally. For completeness, we
present the full treatment of single qubit interference in the same spirit.
