Lyu et al.'s low-degree hardness conjecture for shared-subspace detection
Let Qn\mathbb{Q}_nQn denote the null distribution in which A(l)∼N(l)\bm{A}^{(l)}\sim\bm{N}^{(l)}A(l)∼N(l) for all lll, and let Pn\mathbb{P}_nPn denote the alternative in which…