The paper investigates the non-local property of quantum mechanics by
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quantum dynamics much depend by the strength of the Hamiltonian interaction:
Weakly bounded systems may not be able to maintain the quantum superposition of
states on large distances and lead to the classical stochastic evolution. The
stochastic hydrodynamic quantum approach shows that the wave-function collapse
to an eigenstates can be described by the model itself and that the minimum uncertainty
principle is compatible with the relativistic postulate about the light speed
as the maximum velocity of transmission of interaction. The paper shows that
the Lorenz invariance of the quantum potential does not allow super-luminal
transmission of information in measurements on quantum entangled states.
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