5 problems

Let $\matrices$ denote the matrix algebra in the paper. A linear map $\psi:\matrices\to\matrices$ is PPT if it is completely positive and completely copositive, meaning that both…

The paper considers quantum evolution families governed by GKLS generators and notes that, in the commuting case and for quantum dynamical semigroups with a unique strictly positiv…

Entanglement-breaking volume-ratio conjecture. The volume ratio is

Let $d=2$, so the system is a qubit. Let $\phi\in\mathbf{CPt}_2$ be a qubit channel, where $\mathbf{CPt}_2$ denotes the set of linear, completely positive, trace-preserving maps on…

A positive map is a linear positive map between matrix algebras, and its structural physical approximation is the completely positive map obtained by adding the minimal completely…