Generalized equiangular measurements define families of k-positive maps that act as Schmidt number witnesses detecting k+1 entanglement for two-parameter states in arbitrary dimension with better efficiency than symmetric-operator witnesses.
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Families of $k$-positive maps and Schmidt number witnesses from generalized equiangular measurements
Generalized equiangular measurements define families of k-positive maps that act as Schmidt number witnesses detecting k+1 entanglement for two-parameter states in arbitrary dimension with better efficiency than symmetric-operator witnesses.