The Low-Individual-Degree Test Without the Diagonal-Lines Test Is Not Quantum-Sound

Abstract:To prove the quantum soundness of the classical low-individual-degree test, the authors of \cite{JNVWY20LID} defined three subtests, namely the axis-parallel lines test, the self-consistency test, and the diagonal-lines test. An interesting question is whether the diagonal-lines test can be removed. In this paper, we show that the diagonal-lines test cannot simply be removed without another compatibility mechanism. Consequently, replacing the "conditional linear functions" by "coordinate deletion functions" in the proof of MIP*=RE, as mentioned in \cite{JNVWY20LID}, does not by itself preserve the required soundness. The authors of \cite{JNVWY20LID} found an example that requires the diagonal-lines test when \((m, d, q) = (2, 2, 4)\); we give an example when \((m, d) = (2, 2)\) and \(q\) is any odd prime.

Quantum Physics (quant-ph); Computational Complexity (cs.CC)

arXiv:2609.12346 [quant-ph]

(or arXiv:2609.12346v1 [quant-ph] for this version)

https://doi.org/10.48550/arXiv.2609.12346 Focus to learn more arXiv-issued DOI via DataCite (pending registration)

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