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quant-ph2025
A causal derivation of the algebraic approach to quantum systems
Nick Ormrod
It is commonly assumed that every quantum system is represented by some algebra of operators. Doubt is cast on this assumption by what appears, at first glance, to be a reasonable…
quant-ph2024★ 16 cited
Quantum influences and event relativity
Nick Ormrod, Jonathan Barrett
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 synthesi…
quant-ph2023★ 12 cited
Which theories have a measurement problem?
Nick Ormrod, V. Vilasini, Jonathan Barrett
It is shown that any theory that has certain properties has a measurement problem, in the sense that it makes predictions that are incompatible with measurement outcomes being abso…