On 9/28/2019 2:17 PM, Alan Grayson wrote:
On Friday, September 27, 2019 at 2:29:24 PM UTC-6, Brent wrote:
On 9/27/2019 3:38 AM, Alan Grayson wrote:
1) There is no hint from experiments of a violation of
unitary time
> evolution according to the Schrodinger equation.
Except every measurement ever made in every experiment ever run.
*But if every interaction with the environment in decoherence
satisfies unitary time evolution, how can the result deny unitary
time evolution? AG *
Because unitary evolution cannot convert a superposition to a
mixture, much less to a single value.
Brent
*Not sure I understand. Do you mean that SINCE the system being
measured is originally in a superposition, and finally becomes a
mixture, it implies a denial of unitary time evolution? If so, how do
you know that the final result is mixture? TIA, AG
*
It's only a mixture that can be interpreted as a probability
assignment. Decoherence gets the reduced entropy matrix to a mixture
FAPP...but not exactly, unless we add something new to the theory.
Brent
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