Information Causality in the Quantum and Post-Quantum Regime

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.

7 pages, 4 figures + Supplement(2 pages, 3 figures)

References in corpus (6)

• A wavelength-tunable fiber-coupled source of narrowband entangled photons
• Non-locality distillation and post-quantum theories with trivial communication complexity
• Recovering part of the quantum boundary from information causality
• Observation of tunable Popescu-Rohrlich correlations through post-selection of a gaussian state
• Macroscopically local correlations can violate information causality
• Implausible Consequences of Superstrong Nonlocality