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UID:69ecfdf26f97d
DTSTART:20260428T100000Z
SEQUENCE:0
TRANSP:OPAQUE
DTEND:20260428T110000Z
LOCATION:Elements Room
SUMMARY:ICFO | KUNTAL SENGUPTA
CLASS:PUBLIC
DESCRIPTION:Correlation self-testing of quantum theory involves identifying
  a task or set of tasks whose optimal performance can be achieved only by 
 theories that can realise the same set of correlations as quantum theory i
 n every causal structure. Following this approach\, previous work has rule
 d out various classes of generalised probabilistic theories whose joint st
 ate spaces have a certain regularity in the sense of a (discrete) rotation
  symmetry of the bipartite state spaces. Here we consider theories whose b
 ipartite state spaces lack this regularity. We form them by taking the con
 vex hull of all the local states an a finite number of non-local states. W
 e show that a criterion of compositional consistency is needed in such the
 ories: for a measurement effect to be valid\, there must exist at least on
 e measurement that it is part of. This goes beyond previous consistency cr
 iteria and corresponds to a strengthening of the no-restriction hypothesis
 . We show that quantum theory outperforms these theories in a task called 
 the adaptive CHSH game\, which shows that they can be ruled out experiment
 ally. We further show a connection between compositional consistency and T
 sirelson&rsquo\;s bound.
DTSTAMP:20260425T174626Z
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