Activation of Nonlocal Quantum Resources

Miguel Navascués and Tamás Vértesi
Phys. Rev. Lett. 106, 060403 – Published 11 February 2011

Abstract

We find two two-qubit bipartite states ρ1,ρ2 such that arbitrarily many copies of one or the other cannot exhibit nonlocal correlations in a two-setting–two-outcome Bell scenario. However, the bipartite state ρ1ρ2 violates the Clauser-Horne-Shimony-Holt (CHSH) Bell inequality [J. F. Clauser, M. A. Horne, A. Shimony, and R. A. Holt, Phys. Rev. Lett. 23, 880 (1969).] by an amount of 2.023. We also identify a CHSH-local state ρ such that ρ2 is CHSH inequality-violating. The tools employed can be easily adapted to find instances of nonlocality activation in arbitrary Bell scenarios.

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  • Received 22 November 2010

DOI:https://doi.org/10.1103/PhysRevLett.106.060403

© 2011 American Physical Society

Authors & Affiliations

Miguel Navascués1 and Tamás Vértesi2

  • 1Departamento Análisis Matemático, Universidad Complutense de Madrid, 28040 Madrid, Spain
  • 2Institute of Nuclear Research of the Hungarian Academy of Sciences, H-4001 Debrecen, P.O. Box 51, Hungary

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Vol. 106, Iss. 6 — 11 February 2011

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