On 05 Dec 2017, at 02:05, Brent Meeker wrote:
On 12/4/2017 4:48 PM, Bruce Kellett wrote:
Do you not understand that one of the enduring mysteries of quantum
theory is the emergence of the classical world from the purely
quantum substrate? Decoherence goes a long way towards answering
the underlying problems, but unless something intervenes to exactly
zero the off-diagonal terms in the density matrix, the the
understanding that we have is still only FAPP.
Yes, this is the interesting question. If the off diagonal terms,
in some preferred basis, go exactly to zero, then Everett's multiple
worlds is irrelevant. We only need to find that event which makes
them zero...which is equivalent to collapse. Zurek purports to do
this by saying that an immediate repetition of a measurement must
produce the same eigenvalue. But that seems to me just another way
of saying a measurement must collapse the wave function - except
Zurek is attributing this zeroing of cross terms to the decoherence
in the environment.
Which I think is the only way to get consistent with Everett analysis.
Bruno
Brent
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