Preprint 67/2007

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
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.

21.02.2013, 01:42