# Berlin 2014 – wissenschaftliches Programm

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# AGPhil: Arbeitsgruppe Philosophie der Physik

## AGPhil 7: Quantum-Classical Divide V

### AGPhil 7.2: Vortrag

### Freitag, 21. März 2014, 14:45–15:15, SPA SR22

**The Quantum-Classical Divide and the Kochen-Specker Theorem: A Case for the Nonlocality of Time?** — •Martin Schüle — IHPST, 13, rue du Four 75006 Paris

In quantum physics, the properties of two systems can exhibit long-range correlations although there is no direct contact between the systems. Bell's analysis of the situation led to his famous no-go theorem which says that it is not possible to introduce additional variables that would explain these correlations. The additional variables must thereby satisfy certain intuitive constraints such as "locality". The impossibility of such a "hidden" or additional variable theory thus firmly established the issue of nonlocality in physics and philosophy of physics, which may be seen as a central characteristic of the quantum-classical divide.

In my contribution, I will discuss the no-go theorem by Kochen and Specker and claim that it is in a certain sense more fundamental than Bell's theorem, providing some evidence that Bell's theorem is historically and conceptually based on the Kochen-Specker theorem. Interpreted this way, the Kocher-Specker theorem does not only allow for a Bell-type argument implying nonlocality in space, but possibly also "nonlocality" in time, that is, correlations between time- like separated events that cannot be causally connected. I will then discuss some experimental evidence of this "nonlocality" and its conceptual and philosophical implications.