Quantum mechanics is a non-local theory, however not a maximally non-local one according to relativity. More precisely, there exist alternative theories containing more non-locality than quantum mechanics that still respect the no-signaling principle. Why these theories are unlikely to exist in nature, and what physical principle limits quantum non-locality is still not known today, despite an intensive research effort. After briefly reviewing general non-signaling theories, in particular focusing on non-local boxes, I will present recent work which aims at recovering quantum correlations from information-theoretic principles, such as communication complexity and information causality.
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