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 >
This is what I have been arguing; that CI (one world) measurements are possibly statistically irreversible, meaning reversible with hugely low probabilities; NOT irreversible in principle. 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.
