Distilling Nonlocality

Manuel Forster, Severin Winkler, and Stefan Wolf
Phys. Rev. Lett. 102, 120401 – Published 24 March 2009

Abstract

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 nonlocal and have proven to be an interesting resource for information processing. Since nonlocal correlations are more useful if they are stronger, it is natural to ask whether weak nonlocality can be amplified. We give an affirmative answer by presenting the first protocol for distilling nonlocality in the framework of generalized nonsignaling theories. Our protocol works for both quantum and nonquantum correlations. This shows that in many contexts, the extent to which a single instance of a correlation can violate a Clauser-Horne-Shimony-Holt inequality is not a good measure for the usefulness of nonlocality. A more meaningful measure follows from our results.

  • Figure
  • Received 17 November 2008

DOI:https://doi.org/10.1103/PhysRevLett.102.120401

©2009 American Physical Society

Authors & Affiliations

Manuel Forster, Severin Winkler, and Stefan Wolf

  • Computer Science Department, ETH Zürich, CH-8092 Zürich, Switzerland

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Issue

Vol. 102, Iss. 12 — 27 March 2009

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