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Quantum influences and event relativity
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We develop a new interpretation of quantum theory by combining insights from extended Wigner's friend scenarios and quantum causal modelling. In this interpretation, which synthesizes ideas from relational quantum mechanics and consistent histories, events obtain relative to a set of systems, and correspond to projectors that are picked out by causal structure. We articulate these ideas using a precise mathematical formalism. Using this formalism, we show through specific examples and general constructions how quantum phenomena can be modelled and paradoxes avoided; how different scenarios may be classified and the framework of quantum causal models extended; and how one can approach decoherence and emergent classicality without relying on quantum states.
Forward citations
Cited by 3 Pith papers
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Partitions in quantum theory
A definition of multipartitions of quantum systems into possibly non-factor sub-C* algebras, with a representation theorem showing that some partitions, such as fermionic modes, are not fully representable on tensor-p...
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Copenhagenish interpretations of quantum mechanics
A common four-postulate definition of Copenhagenish interpretations, plus an analysis showing Wigner's friend variants force such interpretations to forbid combining certain observers' descriptions.
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Events and their Localisation are Relative to a Lab
Events, their localisation, and even conclusions about indefinite causal order in the quantum switch are shown to depend on the choice of a Lab and its reference degrees of freedom.
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