A geometric construction via shortest-distance projection to the convex set of useless states yields optimal teleportation witnesses and a necessary-and-sufficient usefulness criterion for arbitrary two-qudit states.
Rudin,Functional Analysis, 2nd ed
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Geometric Construction of Optimal Teleportation Witnesses
A geometric construction via shortest-distance projection to the convex set of useless states yields optimal teleportation witnesses and a necessary-and-sufficient usefulness criterion for arbitrary two-qudit states.