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Bounding quantum correlations with indefinite causal order

Autor(en)
Caslav Brukner
Abstrakt

Causal inequalities are bounds on correlations obtained when operations take place in a causal sequence, i.e. in which the background time or definite causal structure pre-exists such that every operation is either in the future, in the past or space-like separated from any other operation. Recently, a framework was developed where quantum theory is assumed to be valid in local laboratories, but where no reference is made to any global causal relations between the operations in the laboratories. The framework was shown to allow for correlations that violate a bipartite causal inequality. Here we prove that the maximal violation of the causal inequality is upper bounded (analogously to the Tsirelson bound) under a restricted set of local operations involving binary observables. The bound is lower than what is algebraically possible.

Organisation(en)
Quantenoptik, Quantennanophysik und Quanteninformation
Externe Organisation(en)
Österreichische Akademie der Wissenschaften (ÖAW)
Journal
New Journal of Physics
Band
17
Anzahl der Seiten
7
ISSN
1367-2630
Publikationsdatum
08-2015
Peer-reviewed
Ja
ÖFOS 2012
103025 Quantenmechanik, 103036 Theoretische Physik, 103028 Relativitätstheorie
Schlagwörter
ASJC Scopus Sachgebiete
Allgemeine Physik und Astronomie
Link zum Portal
https://ucrisportal.univie.ac.at/de/publications/9f4f4ce6-fd41-42b4-9ae4-d8c556ddac8f