Information causality as a physical principle

Marcin Pawłowski (), Tomasz Paterek, Dagomir Kaszlikowski, Valerio Scarani, Andreas Winter and Marek Żukowski
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Marcin Pawłowski: Institute of Theoretical Physics and Astrophysics, University of Gdańsk
Tomasz Paterek: National University of Singapore, 3 Science Drive 2, 117543 Singapore, Singapore
Dagomir Kaszlikowski: National University of Singapore, 3 Science Drive 2, 117543 Singapore, Singapore
Valerio Scarani: National University of Singapore, 3 Science Drive 2, 117543 Singapore, Singapore
Andreas Winter: National University of Singapore, 3 Science Drive 2, 117543 Singapore, Singapore
Marek Żukowski: Institute of Theoretical Physics and Astrophysics, University of Gdańsk

Nature, 2009, vol. 461, issue 7267, 1101-1104

Abstract: Information causality A broad class of theories exist which share the distinguishing characteristics of quantum mechanics, but allow even stronger correlations. Therefore a criterion that could be used to distinguish physical theories from non-physical ones would be of considerable value. The principle of 'information causality', introduced here by Marcin Pawłowski et al., may provide just this. The principle states that communication of m classical bits causes information gain of at most m bits. The authors show that it is respected by classical and quantum physics, but violated by other models that resemble quantum mechanics but with stronger correlations. The principle is a generalization of the no-signalling condition (information cannot be transmitted faster than light) and may be a foundational property of nature.

Date: 2009
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DOI: 10.1038/nature08400

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