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Often cited dictums in Quantum Mechanics include "observation disturbancecauses loss of interference" and "ignorance is interference". In this paper wepropose and describe a series of experiments with modified Mach-Zehnderinterferometers showing that one has to be careful when applying such dictums.We are able to show that without interacting in any way with the light quantum(or quanta) expected to behave "wave-like", interference fringes can be lost bysimply gaining (or having the potential to gain) the which-path knowledge.Erasing this information may revive the interference fringes. Delayed choicecan be added, arriving to an experiment in line with Wheeler's originalproposal. We also show that ignorance is not always synonym with having theinterference fringes. The often-invoked "collapse of the wavefunction" is foundto be a non-necessary ingredient to describe our experiments.

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

Complementarity, quantum erasure and delayed choice with modified Mach-Zehnder interferometers