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Polynomial Bounds on Parallel Repetition for All 3-Player Games with Binary Inputs

Authors Uma Girish, Kunal Mittal, Ran Raz, Wei Zhan

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Author Details

Uma Girish
  • Princeton University, NJ, USA
Kunal Mittal
  • Princeton University, NJ, USA
Ran Raz
  • Princeton University, NJ, USA
Wei Zhan
  • Princeton University, NJ, USA


We thank Justin Holmgren for important conversations and collaboration in early stages of this work.

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Uma Girish, Kunal Mittal, Ran Raz, and Wei Zhan. Polynomial Bounds on Parallel Repetition for All 3-Player Games with Binary Inputs. In Approximation, Randomization, and Combinatorial Optimization. Algorithms and Techniques (APPROX/RANDOM 2022). Leibniz International Proceedings in Informatics (LIPIcs), Volume 245, pp. 6:1-6:17, Schloss Dagstuhl - Leibniz-Zentrum für Informatik (2022)


We prove that for every 3-player (3-prover) game G with value less than one, whose query distribution has the support S = {(1,0,0), (0,1,0), (0,0,1)} of Hamming weight one vectors, the value of the n-fold parallel repetition G^{⊗n} decays polynomially fast to zero; that is, there is a constant c = c(G) > 0 such that the value of the game G^{⊗n} is at most n^{-c}. Following the recent work of Girish, Holmgren, Mittal, Raz and Zhan (STOC 2022), our result is the missing piece that implies a similar bound for a much more general class of multiplayer games: For every 3-player game G over binary questions and arbitrary answer lengths, with value less than 1, there is a constant c = c(G) > 0 such that the value of the game G^{⊗n} is at most n^{-c}. Our proof technique is new and requires many new ideas. For example, we make use of the Level-k inequalities from Boolean Fourier Analysis, which, to the best of our knowledge, have not been explored in this context prior to our work.

Subject Classification

ACM Subject Classification
  • Theory of computation → Computational complexity and cryptography
  • Parallel repetition
  • Multi-prover games
  • Fourier analysis


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