clip: Information causality as a physical principle.

□ 物理: 物理原理としての情報因果律

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(Nature Physics Portal Alert)


Information causality as a physical principle
pp1101 - 1104

A broad class of theories exist which share the distinguishing characteristics of quantum mechanics but allow even stronger correlations. Here, the principle of 'information causality' is introduced and shown to be respected by both classical and quantum physics; however, it is violated by other models that resemble quantum mechanics but with stronger correlations. It is suggested that information causality may help to distinguish physical theories from non-physical ones. We suggest that information causality?a generalization of the no-signalling condition?might be one of the foundational properties of nature.

Marcin Pawlowski et al.
doi:10.1038/nature08400



非シグナル伝達原理における「ボブ」と「アリス」二者間コミュニケーションの情報量と量子相関についての説明。古典通信間において情報伝達が光速度を超えない様態を、確率予測や複製不可能定理といった特殊な量子論を用いず、定量的な情報理論で示しています。シグナル状態に拠らない情報因果律という概念を、非物理境界から物理境界への普遍的な過渡現象とする指摘が面白いです。