On 4/27/2011 12:16 PM, Evgenii Rudnyi wrote:

Recently I have seen interpretation of quantum mechanics in terms ofquantum decoherence, for example Decoherence and the Transition fromQuantum to Classical by Wojciech H. Zurek. What is an attitude ingeneral to this? Is this good? Is there a good text for a layman aboutsuch an approach?## Advertising

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.`

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