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Fig. 2
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Schematic layout of any quantum interference experiment in two-state systems. The essential ingredients are: (i) the mixing in the prepared state α as a coherent superposition of 1 and 2 -the “slits”-; (ii) its propagation -the “arms”- with a phase-shift Δ. The detector D - the “screen”- projects –“filters”- either α or β.
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