The authors classify three-qubit PPT entangled states of rank four into type I (UPB-based, nonzero Lorentz invariant) and type II (zero invariant, explicit one-complex-parameter form under SLOCC) and study related invariants for lower ranks.
Separability problem for multipartite states of rank at most 4.Journal of Physics A: Mathematical and Theoretical, 46(27):275304, jun 2013
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Construction of three-qubit positive-partial-transpose entangled states of rank four
The authors classify three-qubit PPT entangled states of rank four into type I (UPB-based, nonzero Lorentz invariant) and type II (zero invariant, explicit one-complex-parameter form under SLOCC) and study related invariants for lower ranks.