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?


Evgenii


There's a good review paper by Max Schlosshauer

http://arxiv.org/abs/quant-ph/0312059

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.

Brent

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