On 4/27/2011 12:16 PM, Evgenii Rudnyi wrote:
Recently I have seen interpretation of quantum mechanics in terms of
quantum decoherence, for example Decoherence and the Transition from
Quantum to Classical by Wojciech H. Zurek. What is an attitude in
general to this? Is this good? Is there a good text for a layman about
such an approach?
There's a good review paper by Max Schlosshauer
He later expanded it into a book. Decoherence is a real, observed
physical process predicted by QM. Interest in it is due to it's role in
explaining the appearance of the classical world. It explains the
diagonalization of the reduced density matrix (the density matrix after
averaging over the unknown environment). But it doesn't explain the
realization of just one of the diagonal values with probabilities
according to the Born rule. Omnes and some others point out that QM is
a probabilistic theory and so probabilities are all you can expect from it.
There is also a problem in explaining the basis in which the density
matrix is diagonalized; this is know as the einselection problem.
Decoherence theory suggests some possible solutions to the einselection
problem but none are really worked out yet.
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