Local Invariants for a Class of Mixed States

Sergio Albeverio, Shao-Ming Fei, Debashish Goswami

Published 2005-05-21Version 1

We investigate the equivalence of quantum states under local unitary transformations. A complete set of invariants under local unitary transformations is presented for a class of mixed states. It is shown that two states in this class are locally equivalent if and only if all these invariants have equal values for them.