Distilling Non-Locality
| Autor: | Forster, Manuel, Winkler, Severin, Wolf, Stefan |
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| Rok vydání: | 2008 |
| Předmět: | |
| Zdroj: | Phys. Rev. Lett. 102, 120401 (2009) |
| Druh dokumentu: | Working Paper |
| DOI: | 10.1103/PhysRevLett.102.120401 |
| Popis: | Two parts of an entangled quantum state can have a correlation in their joint behavior under measurements that is unexplainable by shared classical information. Such correlations are called non-local and have proven to be an interesting resource for information processing. Since non-local correlations are more useful if they are stronger, it is natural to ask whether weak non-locality can be amplified. We give an affirmative answer by presenting the first protocol for distilling non-locality in the framework of generalized non-signaling theories. Our protocol works for both quantum and non-quantum correlations. This shows that in many contexts, the extent to which a single instance of a correlation can violate a CHSH inequality is not a good measure for the usefulness of non-locality. A more meaningful measure follows from our results. Comment: Revised abstract, introduction and conclusion. Accepted by PRL |
| Databáze: | arXiv |
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