Re: Is State Vector Reduction a 'Process'?

In article <429CC172.3010801@xxxxxxxxxxxx>,
Eugene Stefanovich <eugenev@xxxxxxxxxxxx> wrote:

> 2. Quantum mechanics does not explain the origin of these probabilities.
> All QM can do is to calculate these probabilities.
> In textbook QM, the formula |<a|psi>|^2 is a postulate, but this
> formula can be derived from a more fundamental "quantum logic" approach.
> (see chapter 4 in physics/0504062)
> If you know the rules of quantum mechanics, you can describe the
> state of your system by a vector |psi> in the Hilbert space,
> and the measurement by another vector |a>, and calculate/predict
> the probability of finding value a in the state |psi> by using above
> formula.

Outside of this 'envariance' stuff that I don't really understand, I
know of no way to derive the probability rules from QM -- in particular,
the use of the reduced density matrix really already assumes the Born
rule. Even envariance assumes, a priori, that these probabilities exist
which seems to be avoiding the central question to me.

Aaron

.

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