Local Equivalence of Rank-Two Quantum Mixed States

Albeverio, Sergio; Fei, Shao-Ming; Goswami, Debashish

Local Equivalence of Rank-Two Quantum Mixed States

Authors

Albeverio, Sergio

Fei, Shao-Ming

Goswami, Debashish

Description

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