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文章基本信息

  • 标题:Exponential Separation of Information and Communication
  • 本地全文:下载
  • 作者:Anat Ganor ; Gillat Kol ; Ran Raz
  • 期刊名称:Electronic Colloquium on Computational Complexity
  • 印刷版ISSN:1433-8092
  • 出版年度:2014
  • 卷号:2014
  • 出版社:Universität Trier, Lehrstuhl für Theoretische Computer-Forschung
  • 摘要:

    We show an exponential gap between communication complexity and information complexity, by giving an explicit example for a communication task (relation), with information complexity O(k), and distributional communication complexity 2k. This shows that a communication protocol cannot always be compressed to its internal information. By a result of Braverman, our gap is the largest possible. By a result of Braverman and Rao, our example shows a gap between communication complexity and amortized communication complexity, implying that a tight direct sum result for distributional communication complexity cannot hold.

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