Postquantum Steering

Ana Belen Sainz, Nicolas Brunner, Daniel Cavalcanti, Paul Skrzypczyk, Tamas Vertesi

Research output: Contribution to journalArticle (Academic Journal)peer-review

46 Citations (Scopus)
250 Downloads (Pure)


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
Number of pages6
JournalPhysical Review Letters
Publication statusPublished - 4 Nov 2015


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