  It is shown that for quantum ensembles consisting of equal particles, the
collective micro-causality does not contradict the quantum theory. The
amplitudes of the states of such an ensemble can be divided into small
portions, for each of which evolution in time will be accurately determined,
without any randomness. For ensembles of dissimilar particles, whose
Hamiltonian is represented as a sum of operators belonging to homogeneous
systems, micro-causality will take place on separate small segments, on which
only the selected component will act. In this case, the duration of the terms
for different ensembles will be different. Micro causality is a consequence of
the quantization of amplitudes, which plays a peculiar role for complex systems
in which the amplitudes of individual states are very small. For such systems,
the stochastic description, typical in the standard quantum theory should be
replaced by a causal, i.e. deterministic one. In the article micro-causality is
illustrated by the example of ensembles of two-level atoms in an optical
cavity, considered under the Tavis-Cummings model in the rotating wave
approximation; however, the conclusions are general.
