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.
Searching for extremal PPT entangled states.Optics Communications, 283(5):805–813
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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.