摘要：Given n-copies of an unknown bipartite ( possiblly mixed ) state, our task is to test whether the state is a pure state of not. If one is allowed to use global operations, optimal one-sided error test is the projection onto the symmetric subspace, obviously. Is it possible to approximate the globally optimal measurement by LOCC when n is large?
关键词：statistical test; entanglement; LOCC; group representation
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