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Local Unitary Invariants for Multipartite Quantum Systems
Jing Wang, Ming Li, Shao-Ming Fei and Xianqing Li-Jost
We present an approach of constructing invariants under local unitary transformations for multipartite quantum systems. The invariants constructed in this way can be complement to that in [Science 340 (2013) 1205-1208]. Detailed examples are given to compute such invariant in detail. It is shown that these invariants can be used to detect the local unitary equivalence of degenerated quantum states.