Hi all,
Benno Salwey will give a short presentation *very soon*, at 15:45 in
room E41.1, on:
"Why Tsirelson? - information theoretic constaints on non-locality"
Abstract:
In his well-known work 'On the Einstein Podolsky Rosen paradox' Bell
shows that the correlations that arise from measurements on space-like
separated systems have to respect certain bounds - if the measurement
statistics should originate from so-called Local Hidden Variables.
Quantum mechanics behaves 'non-locally' and violates these bounds,
however, only to a certain degree which is known as 'Tsirelson's
bound'. One can imagine measurement statistics which are more
non-local and violate even Tsirelson's bound, yet are still
'non-signaling' i.e. they cannot be used for (instantaneous)
communication by the observers. Following the question 'why is quantum
mechanics like it is?' one may ask why it does not exceed this bound,
why such more non-local distributions do not arise in nature?
I will discuss some known examples of the drastic impact more
non-local distributions would have on information science, such as a
trivialization of communication complexity (Brassard et al.) and the
violation of a principle called information causality (Pawlowski et
al.).
Best,
-joe