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Description of rank four PPT entangled states of two qutrits

It is known that some two qutrit entangled states of rank 4 with positive partial transpose [PPT] can be built from the unextendible product bases [UPB]. We show that this fact is indeed universal, namely all such states can be constructed from UPB. We also classify the 5-dimensional subspaces of two qutrits which contain only finitely many product states (up to scalar multiple), and in particular those spanned by a UPB.

preprint2011arXivOpen access
Lin ChenDragomir Z. Djokovic
math-phmath.MPquant-ph
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Lin ChenDragomir Z. Djokovic

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