Constructs non-linear entanglement witnesses from any given linear witness that detect additional entangled states, including PPT entangled states, in d1 ⊗ d2 systems and are experimentally realizable via local observables.
The prescription for the construction of linear witness operator can be given in the following theorem
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Construction of a Non-Linear Entanglement Witness Operator in Arbitrary Dimension Using a Given Linear Witness Operator
Constructs non-linear entanglement witnesses from any given linear witness that detect additional entangled states, including PPT entangled states, in d1 ⊗ d2 systems and are experimentally realizable via local observables.