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In this paper we describe and thoroughly discuss three reported experimentsin quantum optics (QO) involving interferometers and non-linear crystals. Weshow that by using a graphical method and an over-simplified model of theparametric down-conversion process, we arrive to explain all the importantresults reported in the respective papers. Indistinguishability is discussed inthe case of separable/non-separable (i.e. entangled) quantum systems and ourinterpretation is sometimes at variance with the one given by the authorsreporting the experiments.

the european physical journal. d, atomic, molecular and optical physics/the european physical journal. d, atomic, molecular, optical and plasma physics

The quantum optical description of three experiments involving non-linear optics using a graphical method