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Maximal incompatibility of locally classical behavior and global causal order in multiparty scenarios

Autor(en)
Ämin Baumeler, Adrien Feix, Stefan Wolf
Abstrakt

Quantum theory in a global space-time gives rise to non-local correlations, which cannot be explained causally in a satisfactory way; this motivates the study of theories with reduced global assumptions. Oreshkov, Costa, and Brukner (2012) proposed a framework in which quantum theory is valid locally but where, at the same time, no global space-time, i.e., predefined causal order, is assumed
beyond the absence of logical paradoxes. It was shown for the two-party case, however, that a global causal order always emerges in the classical limit. Quite naturally, it has been conjectured that the same also holds in the multi-party setting. We show that counter to this belief, classical correlations locally compatible with classical probability theory exist that allow for deterministic
signaling between three or more parties incompatible with any predefined causal order.

Organisation(en)
Quantenoptik, Quantennanophysik und Quanteninformation
Externe Organisation(en)
Università della Svizzera Italiana
Journal
Physical Review A
Band
90
Anzahl der Seiten
7
ISSN
1050-2947
DOI
https://doi.org/10.1103/PhysRevA.90.042106
Publikationsdatum
2014
Peer-reviewed
Ja
ÖFOS 2012
103025 Quantenmechanik
ASJC Scopus Sachgebiete
Atomic and Molecular Physics, and Optics
Link zum Portal
https://ucrisportal.univie.ac.at/de/publications/3002dcf4-a652-45f9-b6f6-d78bc50de0be