Artículo
Problem of quantifying quantum correlations with non-commutative discord
Majtey, Ana Paula
; Bussandri, Diego G.; Osán, Tristán Martín
; Lamberti, Pedro Walter
; Valdés-Hernández, A.
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Fecha de publicación:
09/2017
Editorial:
Springer
Revista:
Quantum Information Processing
ISSN:
1570-0755
e-ISSN:
1573-1332
Idioma:
Inglés
Tipo de recurso:
Artículo publicado
Clasificación temática:
Resumen
In this work we analyze a non-commutativity measure of quantum correlations recently proposed by Guo (Sci Rep 6:25241, 2016). By resorting to a systematic survey of a two-qubit system, we detected an undesirable behavior of such a measure related to its representation-dependence. In the case of pure states, this dependence manifests as a non-satisfactory entanglement measure whenever a representation other than the Schmidt’s is used. In order to avoid this basis-dependence feature, we argue that a minimization procedure over the set of all possible representations of the quantum state is required. In the case of pure states, this minimization can be analytically performed and the optimal basis turns out to be that of Schmidt’s. In addition, the resulting measure inherits the main properties of Guo’s measure and, unlike the latter, it reduces to a legitimate entanglement measure in the case of pure states. Some examples involving general mixed states are also analyzed considering such an optimization. The results show that, in most cases of interest, the use of Guo’s measure can result in an overestimation of quantum correlations. However, since Guo’s measure has the advantage of being easily computable, it might be used as a qualitative estimator of the presence of quantum correlations.
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Articulos(CCT - CORDOBA)
Articulos de CTRO.CIENTIFICO TECNOL.CONICET - CORDOBA
Articulos de CTRO.CIENTIFICO TECNOL.CONICET - CORDOBA
Articulos(IFEG)
Articulos de INST.DE FISICA ENRIQUE GAVIOLA
Articulos de INST.DE FISICA ENRIQUE GAVIOLA
Citación
Majtey, Ana Paula; Bussandri, Diego G.; Osán, Tristán Martín; Lamberti, Pedro Walter; Valdés-Hernández, A.; Problem of quantifying quantum correlations with non-commutative discord; Springer; Quantum Information Processing; 16; 9; 9-2017
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