Physics – Quantum Physics
Scientific paper
2000-03-02
Physics
Quantum Physics
4 pages, RevTeX, 2 figures
Scientific paper
We study separability properties in a 5-dimensional set of states of quantum systems composed of three subsystems of equal but arbitrary finite Hilbert space dimension. These are the states, which can be written as linear combinations of permutation operators, or, equivalently, commute with unitaries of the form UxUxU. We compute explicitly the following subsets: (1) triseparable states, which are convex combinations of triple tensor products, (2) biseparable states, which are separable for a twofold partition of the system, and (3) states with positive partial transpose with respect to such a partition.
Eggeling Tilo
Werner Reinhard F.
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