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Pauli Center for Theoretical Studies

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ETH Zurich (Computer Science and Physics Department)

Quantum Science and Technology

CQT Singapore

QAP European Project

Sandia National Laboratories

Institute for Quantum Computing

id Quantique

Information causality

Marcin Pawlowski, Gdansk

Information Causality [M. Pawłowski et. al. Nature 461, 1101 (2009)] is a recently discovered physical principle, which can be considered a generalized version of no-signalling. It is satisfied by quantum mechanics and violated by most of the theories that allow for probability distributions not possible to be obtained by the measurements of quantum systems. This fact allows to derive from Information Causality tight bounds on some properties of quantum mechanics (eg. Tsirelson bound) or the efficiency of quantum information protocols (eg. random access codes). In this review we present the results of several papers that are concerned with this principle. We start by presenting Information Causality and discuss its derivation. Then we show its already known applications and comment on the possible future ones. Finally, we study the, so-called, no-signalling polytope to see which part of it is in agreement with Information Causality.