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Título: | Unified view of correlations using the square-norm distance |
Autor: | Bellomo, Bruno; Giorgi, Gian Luca CSIC ORCID ; Galve, Fernando CSIC ORCID CVN; Lo Franco, R.; Compagno, G.; Zambrini, Roberta CSIC ORCID | Fecha de publicación: | 5-mar-2012 | Editor: | American Physical Society | Citación: | Physical Review A 85(3): 032104 (2012) | Resumen: | The distance between a quantum state and its closest state not having a certain property has been used to quantify the amount of correlations corresponding to that property. This approach allows a unified view of the various kinds of correlations present in a quantum system. In particular, using relative entropy as a distance measure, total correlations can be meaningfully separated into a quantum part and a classical part thanks to an additive relation involving only the distances between states. Here we investigate a unified view of correlations using as a distance measure the square norm, which has already been used to define the so-called geometric quantum discord. We thus also consider geometric quantifiers for total and classical correlations, finding, for a quite general class of bipartite states, their explicit expressions. We analyze the relationship among geometric total, quantum, and classical correlations, and we find that they no longer satisfy a closed additivity relation. © 2012 American Physical Society. | Versión del editor: | http://dx.doi.org/10.1103/PhysRevA.85.032104 | URI: | http://hdl.handle.net/10261/51593 | DOI: | 10.1103/PhysRevA.85.032104 | E-ISSN: | 1094-1622 | Identificadores: | doi: 10.1103/PhysRevA.85.032104 issn: 1050-2947 |
Aparece en las colecciones: | (IFISC) Artículos |
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Unified view.pdf | 287,62 kB | Adobe PDF | Visualizar/Abrir |
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