Postquantum Steering

Ana Belén Sainz, Nicolas Brunner, Daniel Cavalcanti, Paul Skrzypczyk, Tamás Vértesi

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Abstract

The discovery of postquantum nonlocality, i.e., the existence of nonlocal correlations that are stronger than any quantum correlations but nevertheless consistent with the no-signaling principle, has deepened our understanding of the foundations of quantum theory. In this work, we investigate whether the phenomenon of Einstein-Podolsky-Rosen steering, a different form of quantum nonlocality, can also be generalized beyond quantum theory. While post-quantum steering does not exist in the bipartite case, we prove its existence in the case of three observers. Importantly, we show that postquantum steering is a genuinely new phenomenon, fundamentally different from postquantum nonlocality. Our results provide new insight into the nonlocal correlations of multipartite quantum systems.

Original languageEnglish
Article number190403
JournalPhysical review letters
Volume115
Issue number19
DOIs
Publication statusPublished - Nov 4 2015

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ASJC Scopus subject areas

  • Physics and Astronomy(all)

Cite this

Sainz, A. B., Brunner, N., Cavalcanti, D., Skrzypczyk, P., & Vértesi, T. (2015). Postquantum Steering. Physical review letters, 115(19), [190403]. https://doi.org/10.1103/PhysRevLett.115.190403