quantum mechanics: answers? (Introduction)

by David Turell , Friday, September 13, 2013, 22:22 (3879 days ago) @ dhw


> Thank you. Sadly I remain just as confused. Now the authors seem to be saying that if Alice sends Bob m bits of information about her quantum experiment, Bob can't gain more than m bits of information about the non-quantum world. Is it not possible for Bob to see connections that Alice doesn't see? After all, the authors think that every construct is subjective (see below). And I still don't know what is meant by "information causality". Perhaps you can define it and explain why it is so important.-I interpret this to mean that Bob cannot receive any more information than Alice sends.-> DAVID: Copenhagen was just a way to go forward and not worry about the confusion.[/i]
> 
> On the contrary, these folks REJECT the idea that all of this represents "something real out in the world", and insist that the constructs are subjective! Ruth regards quantum states as "ontologically real possibilities existing in a pre-spacetime realm [...] These possibilities are taken as real because they are physically efficacious, leading indeterministically to transactions which give rise to the empirical events of the spacetime theatre." And the problem of subjectivism "evaporates" because the transaction "is simply observed differently by the different observers" (which in my book = subjectivism). Yes, I am mightily confused.-I think most people still want quantum characteristics to act as if they are totally part of our reality. They are not. I still think of the dividing wall as a semi-permiable membrane. Some comes through, some doesn't, but it all makes sense if we could reside on the other side.