Journal
JOURNAL OF MATHEMATICAL PHYSICS
Volume 45, Issue 12, Pages 4855-4867Publisher
AMER INST PHYSICS
DOI: 10.1063/1.1809255
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We study the invariant theory of trilinear forms over a three-dimensional complex vector space, and apply it to investigate the behavior of pure entangled three-partite qutrit states and their normal forms under local filtering operations (SLOCC). We describe the orbit space of the SLOCC group SL(3,C)(x3) both in its affine and projective versions in terms of a very symmetric normal form parametrized by three complex numbers. The parameters of the possible normal forms of a given state are roots of an algebraic equation, which is proved to be solvable by radicals. The structure of the sets of equivalent normal forms is related to the geometry of certain regular complex polytopes. (C) 2004 American Institute of Physics.
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