Arkhipov’s theorem, graph minors, and linear system nonlocal games
Algebraic Combinatorics, Volume 6 (2023) no. 4, pp. 1119-1162.

The perfect quantum strategies of a linear system game correspond to certain representations of its solution group. We study the solution groups of graph incidence games, which are linear system games in which the underlying linear system is the incidence system of a (non-properly) two-coloured graph. While it is undecidable to determine whether a general linear system game has a perfect quantum strategy, for graph incidence games this problem is solved by Arkhipov’s theorem, which states that the graph incidence game of a connected graph has a perfect quantum strategy if and only if it either has a perfect classical strategy, or the graph is nonplanar. Arkhipov’s criterion can be rephrased as a forbidden minor condition on connected two-coloured graphs. We extend Arkhipov’s theorem by showing that, for graph incidence games of connected two-coloured graphs, every quotient closed property of the solution group has a forbidden minor characterization. We rederive Arkhipov’s theorem from the group theoretic point of view, and then find the forbidden minors for two new properties: finiteness and abelianness. Our methods are entirely combinatorial, and finding the forbidden minors for other quotient closed properties seems to be an interesting combinatorial problem.

Published online:
DOI: 10.5802/alco.292
Classification: 05E15, 05C83, 81P13, 81P40
Keywords: nonlocal games, graph minors, quantum information
Paddock, Connor 1; Russo, Vincent 2; Silverthorne, Turner 3; Slofstra, William 4

1 Institute for Quantum Computing University of Waterloo, and Department of Combinatorics & Optimization University of Waterloo
2 Modellicity Inc., and Unitary Fund
3 Department of Mathematics University of Toronto
4 Institute for Quantum Computing University of Waterloo, and Department of Pure Mathematics University of Waterloo
License: CC-BY 4.0
Copyrights: The authors retain unrestricted copyrights and publishing rights
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Paddock, Connor; Russo, Vincent; Silverthorne, Turner; Slofstra, William. Arkhipov’s theorem, graph minors, and linear system nonlocal games. Algebraic Combinatorics, Volume 6 (2023) no. 4, pp. 1119-1162. doi : 10.5802/alco.292.

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