Hi,
This week's seminar talk will be given by Renato Renner:
Tuesday, Oct. 26, 16:30 in HIT J 52 on Hoenggerberg.
Best regards, Stefan
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On the non-extendibility of quantum theory
Predictions made by quantum theory are generally not deterministic: the theory tells us only how to calculate the probabilities with which measurement outcomes occur. This indeterminism is one of the key differences from classical mechanics and one can ask whether this is the best any theory can offer, or whether observable quantities could be better predicted by some higher theory. We answer this question by showing that quantum theory indeed makes the best possible predictions any theory can possibly make. More precisely, under the assumption that measurement settings can be chosen freely, there cannot exist any extension of quantum theory that provides us with any additional information about the outcomes of future measurements.
Joint work with Roger Colbeck (arXiv:1005.5173)
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