Three-qubit PPT entangled states of rank four are classified by Lorentz invariant into UPB-constructible type I and a one-complex-parameter type II up to SLOCC, with additional analysis of lower-rank invariants.
Experimental detection of qubit-ququart pseudo- bound entanglement using three nuclear spins.Physics Letters A, 383(14):1549–1554, 2019
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Construction of three-qubit positive-partial-transpose entangled states of rank four
Three-qubit PPT entangled states of rank four are classified by Lorentz invariant into UPB-constructible type I and a one-complex-parameter type II up to SLOCC, with additional analysis of lower-rank invariants.