Hi all,

tomorrow's meeting will be a little earlier, so that we may also make it to the theory colloquium at Irchel. Gilles Puetz will give a talk and we'll postpone arXiv discussions till the following week. Here's the title and abstract:

Title:

The measurement dependent local polytope: How quantum nonlocality beats arbitrary lack of free choice An implicit assumption in the derivation of Bell inequalities, and hence the demonstration of quantum nonlocality, is that the measurement settings can be chosen freely. Here we show that this assumption can be relaxed almost completely, i.e. we show that quantum mechanics is nonlocal even with arbitrarily small freedom of choice. To this end, we prove that this type of correlations forms a polytope which we call the measurement dependent local (MDL) polytope. This gives rise to Bell-like inequalities whose violations are incompatible with the assumption of measurement dependent locality, i.e. Bell locality with limited free choice. Apart from fundamental interest, the MDL-polytope and its inequalities are prime candidates to be used in useful applications like randomness extraction or QKD.