Information Causality in the Quantum and Post-Quantum Regime

Martin Ringbauer; Alessandro Fedrizzi; Dominic W. Berry; Andrew G. White

doi:10.1038/srep06955

Information Causality in the Quantum and Post-Quantum Regime

Martin Ringbauer^*, Alessandro Fedrizzi, Dominic W. Berry, Andrew G. White

^*Corresponding author for this work

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Abstract

Quantum correlations can be stronger than anything achieved by classical systems, yet they are not reaching the limit imposed by relativity. The principle of information causality offers a possible explanation for why the world is quantum and why there appear to be no even stronger correlations. Generalizing the no-signaling condition it suggests that the amount of accessible information must not be larger than the amount of transmitted information. Here we study this principle experimentally in the classical, quantum and post-quantum regimes. We simulate correlations that are stronger than allowed by quantum mechanics by exploiting the effect of polarization-dependent loss in a photonic Bell-test experiment. Our method also applies to other fundamental principles and our results highlight the special importance of anisotropic regions of the no-signalling polytope in the study of fundamental principles.

Original language	English
Article number	6955
Number of pages	6
Journal	Scientific Reports
Volume	4
DOIs	https://doi.org/10.1038/srep06955
Publication status	Published - 7 Nov 2014

Keywords

NONLOCALITY
INEQUALITY
PRINCIPLE

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N2 - Quantum correlations can be stronger than anything achieved by classical systems, yet they are not reaching the limit imposed by relativity. The principle of information causality offers a possible explanation for why the world is quantum and why there appear to be no even stronger correlations. Generalizing the no-signaling condition it suggests that the amount of accessible information must not be larger than the amount of transmitted information. Here we study this principle experimentally in the classical, quantum and post-quantum regimes. We simulate correlations that are stronger than allowed by quantum mechanics by exploiting the effect of polarization-dependent loss in a photonic Bell-test experiment. Our method also applies to other fundamental principles and our results highlight the special importance of anisotropic regions of the no-signalling polytope in the study of fundamental principles.

AB - Quantum correlations can be stronger than anything achieved by classical systems, yet they are not reaching the limit imposed by relativity. The principle of information causality offers a possible explanation for why the world is quantum and why there appear to be no even stronger correlations. Generalizing the no-signaling condition it suggests that the amount of accessible information must not be larger than the amount of transmitted information. Here we study this principle experimentally in the classical, quantum and post-quantum regimes. We simulate correlations that are stronger than allowed by quantum mechanics by exploiting the effect of polarization-dependent loss in a photonic Bell-test experiment. Our method also applies to other fundamental principles and our results highlight the special importance of anisotropic regions of the no-signalling polytope in the study of fundamental principles.

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KW - INEQUALITY

KW - PRINCIPLE

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JO - Scientific Reports

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Information Causality in the Quantum and Post-Quantum Regime

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Keywords

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