Home > arpp, philosophy of physics, philosophy of science, quantum mechanics, umontreal > Benno Salwey – Why is quantum theory not more ‘non-local’ than it is ?

Benno Salwey – Why is quantum theory not more ‘non-local’ than it is ?

October 12, 2012 Leave a comment Go to comments


Mardi 16 Octobre, 16h15, au local 422 du Département de Philosophie de l’Université de Montréal, 2910, boul. Édouard-Montpetit.

Why is quantum theory not more

‘non-local’ than it is ?

Par Benno Salwey,

Université de Montréal, Dépt. Informatique

Summary. 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.).

Conférence organisée par l’Atelier de Recherche Philosophie – Physique, Département de Philosophie, Université de Montréal, contact louis.vervoort@umontreal.ca.

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