Deterministic extractors for small-space sources |
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Authors: | Jesse Kamp Anup Rao Salil Vadhan David Zuckerman |
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Affiliation: | 1. Oracle Corporation, 500 Oracle Parkway, Redwood Shores, CA 94065, United States;2. Institute for Advanced Study, Princeton, NJ 08540, United States;3. School of Engineering and Applied Sciences, Harvard University, Cambridge, MA 02138, United States;4. Department of Computer Science, University of Texas, Austin, TX 78712, United States |
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Abstract: | We give polynomial-time, deterministic randomness extractors for sources generated in small space, where we model space s sources on as sources generated by width branching programs. Specifically, there is a constant such that for any , our algorithm extracts bits that are exponentially close to uniform (in variation distance) from space s sources with min-entropy δn, where . Previously, nothing was known for , even for space 0. Our results are obtained by a reduction to the class of total-entropy independent sources. This model generalizes both the well-studied models of independent sources and symbol-fixing sources. These sources consist of a set of r independent smaller sources over , where the total min-entropy over all the smaller sources is k. We give deterministic extractors for such sources when k is as small as , for small enough ?. |
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