Abstract
Superposition principle, as one of the basic principles in quantum mechanics, is essential for numerous quantum phenomena: interference, quantum beats, quantum interference, wave packets, fluorescence, Rabi oscillations, spin echo, superposition of spin states etc. In all those cases a wave function of a quanton is a superposition of two or more eigenstates. Characteristic features of those phenomena are determined by relative phases of different components in the above superposition. But, the standard interpretation of quantum mechanics avoids to attribute physical meaning to phases as well as to relative phases of wave functions. As a consequence, attempts to physically explain and understand those phenomena often encounter paradoxes, difficulties and inconsistencies discussed for example by Feynman1 and Ballentine2 in the case of interference, by Klein et al.3 and Kaiser et al.4 in connection with wave packets, by Wigner5 in connection with spin state superposition, by Schrodinger6 and Brewer and Schenzle7 in relation to fluorescence, etc.
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