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Direct product theorems for classical communication complexity via subdistribution bounds: extended abstract

Published: 17 May 2008 Publication History

Abstract

A basic question in complexity theory is whether the computational resources required for solving k independent instances of the same problem scale as k times the resources required for one instance. We investigate this question in various models of classical communication complexity. We introduce a new measure, the subdistribution bound , which is a relaxation of the well-studied rectangle or corruption bound in communication complexity. We nonetheless show that for the communication complexity of Boolean functions with constant error, the subdistribution bound is the same as the latter measure, up to a constant factor. We prove that the one-way version of this bound tightly captures the one-way public-coin randomized communication complexity of any relation, and the two-way version bounds the two-way public-coin randomized communication complexity from below. More importantly, we show that the bound satisfies the strong direct product property under product distributions for both one- and two-way protocols, and the weak direct product property under arbitrary distributions for two-way protocols. These results subsume and strengthen, in a unified manner, several recent results on the direct product question. The simplicity and broad applicability of our technique is perhaps an indication of its potential to solve yet more challenging questions regarding the direct product problem.

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        cover image ACM Conferences
        STOC '08: Proceedings of the fortieth annual ACM symposium on Theory of computing
        May 2008
        712 pages
        ISBN:9781605580470
        DOI:10.1145/1374376
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        Published: 17 May 2008

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        Author Tags

        1. communication complexity
        2. direct product
        3. information theory
        4. rectangle bounds
        5. subdistribution bounds

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        STOC '08: Symposium on Theory of Computing
        May 17 - 20, 2008
        British Columbia, Victoria, Canada

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        STOC '08 Paper Acceptance Rate 80 of 325 submissions, 25%;
        Overall Acceptance Rate 1,469 of 4,586 submissions, 32%

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