Operational criterion and constructive checks for the separability of low rank density matrices

Pawel Horodecki, Maciej Lewenstein, Guifré Vidal +1

We consider low rank density operators $\varrho$ supported on a $M\times N$ Hilbert space for arbitrary $M$ and $N$ ($M\le N$) and with a positive partial transpose (PPT) $\varrho…