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

To prove the quantum soundness of the classical low-individual-degree test, the authors of 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, does not by itself preserve the required soundness. The authors of 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.