Information causality

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Information causality is a physical principle suggested in 2009.[1] Information Causality states that information gain that a receiver (Bob) can reach about data, previously unknown to him, from a sender (Alice), by using all his local resources and classical bits communicated by the sender, is at most bits.

The principle assumes classical communication: if quantum bits were allowed to be transmitted the information gain could be higher as demonstrated in the quantum superdense coding protocol. The principle is respected by all correlations accessible with quantum physics, while it excludes all correlations which violate the quantum Tsirelson bound for the CHSH inequality. However, it does not exclude beyond-quantum correlations in multipartite situations.[2]

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  1. ^ Marcin Pawlowski, Tomasz Paterek, Dagomir Kaszlikowski, Valerio Scarani, Andreas Winter, and Marek Zukowski, Information Causality as a Physical Principle, Nature 461, 1101 (2009). arXiv:0905.2292 [quant-ph]
  2. ^ R. Gallego, L. E. Würflinger, A. Acín, and M. Navascués, ``Quantum Correlations Require Multipartite Information Principles, Phys. Rev. Lett. 107, 210403 (2011).