,
Nobutaka Shimizu
Creative Commons Attribution 4.0 International license
We present an optimal "worst-case exact to average-case approximate" reduction for matrix multiplication over a finite field of prime order p. Any efficient algorithm that correctly computes, in expectation, at least (1/p + ε)-fraction of entries of the multiplication A ⋅ B of a pair (A, B) of uniformly random matrices over the finite field of order p for a positive constant ε can be transformed into an efficient randomized algorithm that computes A ⋅ B for all the pairs (A, B) of matrices with high probability. Previously, such reductions were known only in a low-error regime (Gola, Shinkar and Singh; RANDOM 2024) or under non-uniform reductions (Hirahara and Shimizu; STOC 2025).
@InProceedings{hirahara_et_al:LIPIcs.ICALP.2025.97,
author = {Hirahara, Shuichi and Shimizu, Nobutaka},
title = {{An Optimal Error-Correcting Reduction for Matrix Multiplication}},
booktitle = {52nd International Colloquium on Automata, Languages, and Programming (ICALP 2025)},
pages = {97:1--97:17},
series = {Leibniz International Proceedings in Informatics (LIPIcs)},
ISBN = {978-3-95977-372-0},
ISSN = {1868-8969},
year = {2025},
volume = {334},
editor = {Censor-Hillel, Keren and Grandoni, Fabrizio and Ouaknine, Jo\"{e}l and Puppis, Gabriele},
publisher = {Schloss Dagstuhl -- Leibniz-Zentrum f{\"u}r Informatik},
address = {Dagstuhl, Germany},
URL = {https://drops.dagstuhl.de/entities/document/10.4230/LIPIcs.ICALP.2025.97},
URN = {urn:nbn:de:0030-drops-234742},
doi = {10.4230/LIPIcs.ICALP.2025.97},
annote = {Keywords: Matrix Multiplication, Error-Correcting Reduction, Average-Case Complexity}
}