A family of positive but not completely positive maps on 4D space is constructed and applied to detect bound entanglement in 4⊗4 systems.
Peres, Phys
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Bound entanglement detection in $4 \otimes 4$ systems via generalized Choi maps
A family of positive but not completely positive maps on 4D space is constructed and applied to detect bound entanglement in 4⊗4 systems.