Invariants for a Class of Nongeneric Three-qubit States
Bao-Zhi Sun and Shao-Ming Fei
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Submission date: 13. Mar. 2006
published in: Communications in theoretical physics, 45 (2006) 6, p. 1007-1010
DOI number (of the published article): 10.1088/0253-6102/45/6/010
PACS-Numbers: 03.67.-a, 02.20.Hj, 03.65.-w
Keywords and phrases: invariant, quantum state, local unitary transformat
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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 non-generic three-qubit mixed states. It is shown that two such states in this class are locally equivalent if and only if all these invariants have equal values for them.