Comment on "Matrix Pencils and Entanglement Classification"

Details Comment on "Matrix Pencils and Entanglement Classification" Comment on "Matrix Pencils and Entanglement Classification"

2009-11-20

arxiv.org/abs/0911.4058v1

Physics

Quantum Physics

Scientific paper

In our earlier posting "Matrix Pencils and Entanglement Classification", arXiv:0911.1803, we gave a polynomial-time algorithm for deciding if two states in a space of dimension $2\otimes m\otimes n$ are SLOCC equivalent. In this note, we point out that a straightforward modification of the algorithm gives a simple enumeration of all SLOCC equivalence classes in the same space, with the class representatives expressed in the Kronecker canonical normal form of matrix pencils. Thus, two states are equivalent if and only if they have the same canonical form. As an example, we present representatives in canonical form for each of the 26 equivalence classes in $2\otimes 3\otimes n$ systems.

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