On Sunday, May 6, 2018 at 3:55:06 AM UTC, agrays...@gmail.com 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 everything-list+unsubscr...@googlegroups.com. To post to this group, send email to everything-list@googlegroups.com. Visit this group at https://groups.google.com/group/everything-list. For more options, visit https://groups.google.com/d/optout.
