Local equivalence of rank-2 quantum mixed states

Albeverio, Sergio ; Fei, Shao-Ming ; Goswami, Debashish (2007) Local equivalence of rank-2 quantum mixed states Journal of Physics A: Mathematical and Theoretical, 40 (36). Article ID 11113. ISSN 1751-8121

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Official URL: http://iopscience.iop.org/article/10.1088/1751-811...

Related URL: http://dx.doi.org/10.1088/1751-8113/40/36/011


We investigate the equivalence of quantum mixed states under local unitary transformations. For a class of rank-2 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.

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