The equivalence of multipartite quantum mixed states under local unitary transformations is studied. A criterion for the equivalence of non-degenerate mixed multipartite quantum states under local unitary transformations is presented.
@article{arxiv.quant-ph/0602136,
title = {Matrix Tensor Product Approach to the Equivalence of Multipartite States under Local Unitary Transformations},
author = {X. H. Gao and S. Alberverio and S. M. Fei and Z. X. Wang},
journal= {arXiv preprint arXiv:quant-ph/0602136},
year = {2015}
}