Local Equivalence of Rank-Two Quantum Mixed States

Sergio Albeverio, Shao-Ming Fei, and Debashish Goswami

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Submission date: 30. Jul. 2007
Pages: 8
published in: Journal of physics / A, 40 (2007) 36, p. 11113-11117 
DOI number (of the published article): 10.1088/1751-8113/40/36/011
Bibtex
PACS-Numbers: 03.67.-a, 02.20.Hj, 03.65.-w
Keywords and phrases: Local Equivalence, Rank-Two Mixed States
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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.