Optimal convex approximations of quantum states

Author(s): Massimiliano F. Sacchi
We consider the problem of optimally approximating an unavailable quantum state $ρ$ by the convex mixing of states drawn from a set of available states ${{ν}_{i}}$. The problem is recast to look for the least distinguishable state from $ρ$ among the convex set ${∑}_{i}{p}_{i}{ν}_{i}$, and the corres...
[Phys. Rev. A 96, 042325] Published Wed Oct 18, 2017

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