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Perspectives on Information Causality

Tony Short ( Research Fellow at the Department of Applied Mathematics and Theoretical Physics, University of Cambridge )

The information causality principle [1] is a generalisation
of the no-signalling principle which is obeyed by quantum and
classical physics, but which rules out many other theories. In this
talk, I will present two new perspectives on information causality
[2]: a probabilistic analysis yielding simple quadratic bounds on the
set of quantum correlations, and an entropic analysis suggesting that
the ability to define a `good' measure of entropy in quantum theory is
one of its defining features.

[1] M. Pawlowski et al., Nature 461, 1101 (2009).
[2] S.W. Al-Safi and A.J. Short, PRA 84, 042323 (2011).



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