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The chain rule implies Tsirelson's bound: an approach from generalized mutual information
In order to analyze an information theoretical derivation of Tsirelson's
bound based on information causality, we introduce a generalized mutual
information (GMI), defined as the optimal coding rate of a channel with
classical inputs and general probabilistic outputs. In the case where the
outputs are quantum, the GMI coincides with the quantum mutual information. In
general, the GMI does not necessarily satisfy the chain rule. We prove that
Tsirelson's bound can be derived by imposing the chain rule on the GMI. We
formulate a principle, which we call the no-supersignalling condition, which
states that the assistance of nonlocal correlations does not increase the
capability of classical communication. We prove that this condition is
equivalent to the no-signalling condition. As a result, we show that
Tsirelson's bound is implied by the nonpositivity of the quantitative
difference between information causality and no-supersignalling.Comment: 23 pages, 8 figures, Added Section 2 and Appendix B, result
unchanged, Added reference
Occurrence of the eelgrass pathogen, Labyrinthula zosterae, in Japan
The marine slime mold Labyrinthula zosterae, the causative agent of wasting disease of eelgrass Zostera marina, has been isolated from both 2. marina and 2. caulescens on the south coast of Japan. In addition, wasting-disease symptoms were produced in disease tests on leaves of Z. japonica and 2. marina using axenic cultures of L. zosterae isolated from Z. caulescens and Z. marina. Thus, the known host species of L. zosterae are expanded to include 3 species of Zostera. Although symptomatic necrotic lesions were observed in field-collected seagrass leaves, widespread die-off from wasting disease was not evident on the south coast of Japan
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