3 problems

Let $D(\mathcal{S})$ denote the density operators supported on an $r$-dimensional subspace $\mathcal{S}\subseteq\mathbb{C}^n$, and let $K_{n,r}$ be the suboptimality ratio defined…

Let a covariant POVM be a POVM with the covariance property considered in the paper, and let a $d$-outcome simulator be a simulation using POVMs with $d$ outcomes. A simulator is a…

Let $M\in\operatorname{Herm}(\mathbb{C}^3)$ be a positive semidefinite seed of trace $1/3$, and construct a nine-outcome POVM by conjugating $M$ with the discrete Heisenberg-group…