F > CORRECTION TO PREVIOUS STATEMENT: > I conflated time reversibility with time symmetry. So ignore comments > about the latter. AG >
2ND CORRECTION TO PREVIOUS STATEMENT: I don't think I correctly described the time revered process. It does NOT simply involve taking the backward path through the SG; rather, it requires undoing or reversing all the measurement entanglements. Even if this could be modeled, IMO it cannot recover the original superposition if one assumes, as I do, that QM is irreducibly random. In such case, although distribution functions might exist for the parameters defining the measurement entanglements, this information, being statistical, is insufficient to determine from what precise state they came from; much like the case of a screen impact in the double slit experiment. Knowing the distribution of positions, is insufficient for a single outcome for backing out the state from it originated. Here I am thinking of each spin measurement entanglement as being analogous to single impact in a double slit experiment. For each entanglement associated with a given measurement, we cannot back out the state from which it originated in order to do a time reversed thought experiment where all entanglements are backed out, for determining the original state of the system, in this case, an electron which is measured spin UP. AG -- You received this message because you are subscribed to the Google Groups "Everything List" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. To post to this group, send email to [email protected]. Visit this group at https://groups.google.com/group/everything-list. For more options, visit https://groups.google.com/d/optout.
