2001/07/23 by Hao Chen, Chen, Hao
Physics and Astronomy · #FOS: Physical sciences #Quantum Physics (quant-ph) #quant-ph
paper · pdf · doi:10.48550/arxiv.quant-ph/0107112
10 pages, no figure, minor changes in v2
arxiv created 2001/08/12 · arxiv updated 2009/12/01
We introduce algebraic sets in the products of complex projective spaces for the mixed states in multipartite quantum systems as their invariants under local unitary operations. The algebraic sets have to be the union of the linear subspaces if the state is separable. Some examples are studied based on our criterion