N-Qubit W States are Determined by their Bipartite Marginals
N-Qubit W States are Determined by their Bipartite Marginals
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DOI：
10.1103/physreva.80.012319
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发表时间：
2008-09
影响因子：
2.9
通讯作者：
P. Parashar;S. Rana
中科院分区：
文献类型：
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作者：
P. Parashar;S. Rana
我们证明了最一般的W类N-量子比特态在任意态（纯态或混合态）中仅由它们的二分约化密度矩阵唯一确定。此外，如果我们只考虑纯态，则其中（N-1）个是充分的。
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.