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Delayed-choice erasure is investigated in two-photon two-slit experimentsthat are generalizations of the micromaser experiment of Scully et al. [Scully,M. O. et al. Nature 351, 111-116 (1991)]. Applying quantum mechanics to thelocalization detector, it is shown that erasure with delayed choice in thesense of Scully, has an analogous structure as simple erasure. The descriptiongoes beyond probabilities. The EPR-type disentanglement, consisting in twomutually incompatible distant measurements, is used as a general framework inboth parts of this study. Two simple coherence cases are shown to emergenaturally, and they are precisely the two experiments of Scully et al. Thetreatment seems to require the relative-reality-of-unitarily-evolving-state(RRUES) approach. Besides insight in the exoeriments, this study has also thegoal of insight in quantum mechanics. The question is if it can be more thanjust a "book-keeping device" for calculating probabilities as Scully et al.modestly and cautiously claim.

On the EPR-type Entanglement in the Experiments of Scully et Al. I. The Micromaser Case and Delayed-choice Quantum Erasure