Many physicists limit oneself to an instrumentalist description of quantum phenomena and ignore the problems of
foundation and interpretation of quantum mechanics. This instrumentalist approach results to "specialization barbarism"
and mass delusion concerning the problem, how a quantum computer can be made. The idea of quantum computation
can be described within the limits of quantum formalism. But in order to understand how this idea can be put into
practice one should realize the question: "What could the quantum formalism describe?", in spite of the absence of an
universally recognized answer. Only a realization of this question and the undecided problem of quantum foundations
allows to see in which quantum systems the superposition and EPR correlation could be expected. Because of the
"specialization barbarism" many authors are sure that Bell proved full impossibility of any hidden-variables
interpretation. Therefore it is important to emphasize that in reality Bell has restricted to validity limits of the no-hidden-variables
proof and has shown that two-state quantum system can be described by hidden variables. The later means that
no experimental result obtained on two-state quantum system can prove the existence of superposition and violation of
the realism. One should not assume before unambiguous experimental evidence that any two-state quantum system is
quantum bit. No experimental evidence of superposition of macroscopically distinct quantum states and of a quantum bit
on base of superconductor structure was obtained for the present. Moreover same experimental results can not be
described in the limits of the quantum formalism.