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N-Qubit W States are Determined by their Bipartite Marginals

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Published Article
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DOI: 10.1103/PhysRevA.80.012319
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arXiv
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Abstract

We prove that the most general W class of N-qubit states are uniquely determined among arbitrary states (pure or mixed) by just their bipartite reduced density matrices. Moreover, if we consider only pure states, then (N-1) of them are shown to be sufficient.

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