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The communication complexity of gap Hamming distance. (English) Zbl 1253.68158

Summary: In the gap Hamming distance problem, two parties must determine whether their respective strings \(x,y\in\{0,1\}^n\) are at Hamming distance less than \(n/2-\sqrt n\) or greater than \(n/2+\sqrt n.\) In a recent tour de force, A. Chakrabarti and O. Regev [“An optimal lower bound on the communication complexity of gap-hamming-distance”, in: STOC ’11. Proceedings of the 43rd annual ACM symposium on theory of computing. New York, NY: Association for Computing Machinery (ACM). 51–60 (2011; doi:10.1145/1993636.1993644)] proved the long-conjectured \(\Omega(n)\) bound on the randomized communication complexity of this problem. In follow-up work,T. Vidick [“A concentration inequality for the overlap of a vector on a large set, with application to the communication complexity of the Gap-Hamming-Distance problem”, Technical Report TR11-051, Electron. Colloq. Comput. Complexity (ECCC) (2010), http://eccc.hpi-web.de/eccc-reports/2011/TR11-051/] discovered a simpler proof. We contribute a new proof, which is simpler yet and a page-and-a-half long.

MSC:

68Q17 Computational difficulty of problems (lower bounds, completeness, difficulty of approximation, etc.)
68Q25 Analysis of algorithms and problem complexity

References:

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