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An Exposition of Bourgain's 2-Source Extractor March 28, 2007

Summary: An Exposition of Bourgain's 2-Source Extractor
Anup Rao
March 28, 2007
A construction of Bourgain [Bou05] gave the first 2-source extractor to break the min-entropy
rate 1/2 barrier. In this note, we write an exposition of his result, giving a high level way to view
his extractor construction.
We also include a proof of a generalization of Vazirani's XOR lemma that seems interesting in
its own right, and an argument (due to Boaz Barak) that shows that any two source extractor with
sufficiently small error must be strong.
Keywords: Extractors

Department of Computer Science, University of Texas at Austin, arao@cs.utexas.edu. Supported in part by an
MCD fellowship from UT Austin and NSF Grant CCR-0310960.
1 Introduction
The min-entropy of a distribution is k if
Pr[X = x] = 2-k
We say that a function Ext : {0, 1}n {0, 1}n {0, 1}m is a 2-source extractor for entropy k if


Source: Anderson, Richard - Department of Computer Science and Engineering, University of Washington at Seattle


Collections: Computer Technologies and Information Sciences