  Any real interaction process produces many incompatible system versions, or
realisations, giving rise to omnipresent dynamic randomness and universally
defined complexity (arXiv:physics/9806002). Since quantum behaviour dynamically
emerges as the lowest complexity level (arXiv:quant-ph/9902016), quantum
interaction randomness can only be relatively strong, which reveals the causal
origin of quantum indeterminacy (arXiv:quant-ph/9511037) and true quantum chaos
(arXiv:quant-ph/9511035), but rigorously excludes the possibility of unitary
quantum computation, even in an "ideal", noiseless system. Any real computation
is an internally chaotic (multivalued) process of system complexity development
occurring in different regimes. Unitary quantum machines, including their
postulated "magic", cannot be realised as such because their dynamically
single-valued scheme is incompatible with the irreducibly high dynamic
randomness at quantum complexity levels and should be replaced by explicitly
chaotic, intrinsically creative machines already realised in living organisms
and providing their quite different, realistic kind of magic. The related
concepts of reality-based, complex-dynamical nanotechnology, biotechnology and
intelligence are outlined, together with the ensuing change in research
strategy. The unreduced, dynamically multivalued solution to the many-body
problem reveals the true, complex-dynamical basis of solid-state dynamics,
including the origin and internal dynamics of macroscopic quantum states. The
critical, "end-of-science" state of unitary knowledge and the way to positive
change are causally specified within the same, universal concept of complexity.
