  We argue here for a more conceptual or qualitative approach in the
introductory teaching of Quantum Physics which is built on the basis of
epistemological and ontological discussions and as such is a valuable tool
mainly in the initial and continued formation of school teachers. We illustrate
our point with the analysis of undulatory and corpuscular phenomena of a single
photon in a virtual Mach-Zehnder Interferometer - an experimental setup similar
to double slits device but simpler - using key ideas of the most known
interpretations of quantum formalism, including the many worlds interpretation.
