“…The MZI appears in a considerable part of literature concerning to quantum physics teaching and its quantum description is detailed in some of them [9,10,11,12,13]. Our group has also produced some papers adopting the MZI as the central device and didactical tool over the past years [1,14,15,16,17,18,19,20,21,22], two of them addressing complementarity [23,24]. In this paper, the mathematical treatment, barely explained in previous papers, will be much better detailed.…”