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Quantum networks reveal quantum nonlocality

Author

Listed:
  • Daniel Cavalcanti

    (Centre for Quantum Technologies, National University of Singapore)

  • Mafalda L. Almeida

    (ICFO-Institut de Ciencies Fotoniques, Castelldefels, Barcelona 08860, Spain.)

  • Valerio Scarani

    (Centre for Quantum Technologies, National University of Singapore
    National University of Singapore)

  • Antonio Acín

    (ICFO-Institut de Ciencies Fotoniques, Castelldefels, Barcelona 08860, Spain.
    ICREA-Institucio Catalana de Recerca i Estudis Avançats)

Abstract

The results of local measurements on some composite quantum systems cannot be reproduced classically. This impossibility, known as quantum nonlocality, represents a milestone in the foundations of quantum theory. Quantum nonlocality is also a valuable resource for information-processing tasks, for example, quantum communication, quantum key distribution, quantum state estimation or randomness extraction. Still, deciding whether a quantum state is nonlocal remains a challenging problem. Here, we introduce a novel approach to this question: we study the nonlocal properties of quantum states when distributed and measured in networks. We show, using our framework, how any one-way entanglement distillable state leads to nonlocal correlations and prove that quantum nonlocality is a non-additive resource, which can be activated. There exist states, local at the single-copy level, that become nonlocal when taking several copies of them. Our results imply that the nonlocality of quantum states strongly depends on the measurement context.

Suggested Citation

  • Daniel Cavalcanti & Mafalda L. Almeida & Valerio Scarani & Antonio Acín, 2011. "Quantum networks reveal quantum nonlocality," Nature Communications, Nature, vol. 2(1), pages 1-6, September.
    • Handle: RePEc:nat:natcom:v:2:y:2011:i:1:d:10.1038_ncomms1193
    DOI: 10.1038/ncomms1193
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    Cited by:

    1. Yang, Yan-Han & Yang, Xue & Luo, Ming-Xing, 2023. "Device-independently verifying full network nonlocality of quantum networks," Physica A: Statistical Mechanics and its Applications, Elsevier, vol. 617(C).
    2. Luis Villegas-Aguilar & Emanuele Polino & Farzad Ghafari & Marco Túlio Quintino & Kiarn T. Laverick & Ian R. Berkman & Sven Rogge & Lynden K. Shalm & Nora Tischler & Eric G. Cavalcanti & Sergei Slussa, 2024. "Nonlocality activation in a photonic quantum network," Nature Communications, Nature, vol. 15(1), pages 1-8, December.

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