4.8 Article

Information Causality without Concatenation

期刊

PHYSICAL REVIEW LETTERS
卷 126, 期 22, 页码 -

出版社

AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.126.220403

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资金

  1. Foundation for Polish Science (IRAP project, ICTQT) [2018/MAB/5]
  2. EU within Smart Growth Operational Programme
  3. NCN [2018/30/Q/ST2/00625]
  4. QuantERA, an ERA-Net cofund in Quantum Technologies, under the project eDICT

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The principle of information causality can be used to bound nonlocality in quantum mechanics, simplifying derivations and improvements of Bell inequalities by relying on communication channel capacity rather than concatenation of resources.
Information causality is a physical principle which states that the amount of randomly accessible data over a classical communication channel cannot exceed its capacity, even if the sender and the receiver have access to a source of nonlocal correlations. This principle can be used to bound the nonlocality of quantum mechanics without resorting to its full formalism, with a notable example of reproducing the Tsirelson's bound of the Clauser-Horne-Shimony-Holt inequality. Despite being promising, the latter result found little generalization to other Bell inequalities because of the limitations imposed by the process of concatenation, in which several nonsignaling resources are put together to produce tighter bounds. In this work, we show that concatenation can be successfully replaced by limits on the communication channel capacity. It allows us to rederive and, in some cases, significantly improve all the previously known results in a simpler manner and apply the information causality principle to previously unapproachable Bell scenarios.

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