On Sunday, May 6, 2018 at 3:55:06 AM UTC, [email protected] wrote: > > > > On Friday, May 4, 2018 at 5:49:15 PM UTC, Lawrence Crowell wrote: >> >> On Friday, May 4, 2018 at 8:21:52 AM UTC-5, Bruce wrote: >>> >>> >>> Unfortunately, it is not the case that you can implement absolutely any >>> unitary transformation in this way. For instance, you cannot implement the >>> unitary transformation that would reverse a totally decohered event. Your >>> quantum computer ceases to function if there is any decoherence! For >>> example, you cannot implement a unitary transformation that would resurrect >>> my dead grandfather, even though his life and death were entirely unitary. >>> So you cannot reverse a recorded measurement. >>> >>> Bruce >>> >> >> Weak measurements are or come close to being reversible. There is an >> effort to know what the limits are on this, So far the boundary between a >> hard and weak measurement appears flexible. This means that if one had some >> vast master equation for all the reservior of interacting states that a >> hard measurement might be reversible. Of course from a practical >> perspective this becomes implausible. >> >> LC >> > > I have been exploring that model for the reversibility of quantum > measurements. But as I recently posted in reply, the existence of such a > reversible process would contradict Bell experiments. Wouldn't running > those reservoir states backward, imply the existence of huge set of local > hidden variables? AG >
The question I am raising is this; if we could identify a single reservoir state that was entangled with the wf of the system being measured, and if it could be reversed by some identifiable, describable physical process, would this imply a local hidden variable for this particular entangled system disallowed by Bell experiments? 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.
