Uniform hardness versus randomness tradeoffs for Arthur-Merlin games

  • Authors:
  • Dan Gutfreund;Ronen Shaltiel;Amnon Ta-Shma

  • Affiliations:
  • School of Computer Science and Engineering, The Hebrew University of Jerusalem, Jerusalem, Israel, 91904;Department of Applied Mathematics and Computer Science, Weizmann Institute of Science, Rehovot, Israel, 76100;Computer Science Department, Tel-Aviv University, Tel-Aviv, Israel, 69978

  • Venue:
  • Computational Complexity
  • Year:
  • 2004

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Abstract

Impagliazzo and Wigderson proved a uniform hardness vs. randomness "gap theorem" for BPP. We show an analogous result for AM: Either Arthur-Merlin protocols are very strong and everything in E = DTIME(2O(n)) can be proved to a subexponential time verifier, or else Arthur-Merlin protocols are weak and every language in AM has a polynomial time nondeterministic algorithm such that it is infeasible to come up with inputs on which the algorithm fails. We also show that if Arthur-Merlin protocols are not very strong (in the sense explained above) then AM ∩ coAM = NP ∩ coNP.Our technique combines the nonuniform hardness versus randomness tradeoff of Miltersen and Vinodchandran with "instance checking". A key ingredient in our proof is identifying a novel "resilience" property of hardness vs. randomness tradeoffs.