Journal
PHYSICAL REVIEW LETTERS
Volume 115, Issue 19, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.115.190403
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Funding
- Swiss National Science Foundation [PP00P2_138917, BSSGIO_155818]
- SEFRI (COST Action) [MP1006]
- EU SIQS
- Beatriu de Pinos [BP-DGR 2013]
- EPSRC Grant DIQIP
- ERC AdG NLST
- ERC CoG QITBOX
- Janos Bolyai Programme
- OTKA [K111734]
- Engineering and Physical Sciences Research Council [EP/J007838/1] Funding Source: researchfish
- EPSRC [EP/J007838/1] Funding Source: UKRI
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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.
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