Local Equivalence of Rank-Two Quantum Mixed States
arXiv:0711.1210 · doi:10.1088/1751-8113/40/36/011
Abstract
We investigate the equivalence of quantum mixed states under local unitary transformations. For a class of rank-two mixed states, a sufficient and necessary condition of local equivalence is obtained by giving a complete set of invariants under local unitary transformations, such that two states in this class are locally equivalent if and only if all these invariants have equal values for them.
6 pages