Choi polynomials enable constructions of indecomposable positive maps that serve as entanglement witnesses for PPT entangled states in matrix tensor products.
Osaka,Indecomposable positive maps in low dimensional matrix algebras, Linear Algebra Appl.153(1991), 73-83
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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.