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