Quantum networks reveal quantum nonlocality

Daniel Cavalcanti (), Mafalda L. Almeida, Valerio Scarani and Antonio Acín
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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
Antonio Acín: ICFO-Institut de Ciencies Fotoniques, Castelldefels, Barcelona 08860, Spain.

Nature Communications, 2011, vol. 2, issue 1, 1-6

Abstract: 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.

Date: 2011
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DOI: 10.1038/ncomms1193

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