Three-by-three bound entanglement with general unextendible product bases

Details Three-by-three bound entanglement with general unextendible product bases Three-by-three bound entanglement with general unextendible product bases

2011-05-13

arxiv.org/abs/1105.2709v1

Physics

Mathematical Physics

36 pages

Scientific paper

We discuss the subject of Unextendible Product Bases with the orthogonality condition dropped and we prove that the lowest rank non-separable positive-partial-transpose states, i.e. states of rank 4 in 3 x 3 systems are always locally equivalent to a projection onto the orthogonal complement of a linear subspace spanned by an orthogonal Unextendible Product Basis. The product vectors in the kernels of the states belong to a non-zero measure subset of all general Unextendible Product Bases, nevertheless they can always be locally transformed to the orthogonal form. This fully confirms the surprising numerical results recently reported by Leinaas et al. Parts of the paper rely heavily on the use of Bezout's Theorem from algebraic geometry.

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