Choi polynomials enable constructions of indecomposable positive maps that serve as entanglement witnesses for PPT entangled states in matrix tensor products.
Osaka,A series of absolutely indecomposable positive maps in matrix algebras, Linear Algebra Appl.186(1993), 45-53
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Some applications of Choi polynomials of linear maps
Choi polynomials enable constructions of indecomposable positive maps that serve as entanglement witnesses for PPT entangled states in matrix tensor products.