Quantum theory from rules on information acquisition

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conference paper description
We provide an accessible and mostly self-contained summary of a recent reconstruction of quantum theory, for qubit systems, from rules constraining an observer's acquisition of information [arXiv:1412.8323, arXiv:1511.01130]. The focus lies on the main ideas and results, not the technical details. This reconstruction offers an instructive, informational explanation for the architecture of the theory and, as a by-product, unravels new `conserved informational charges', indeed appearing in quantum theory, that characterize the unitary group and the set of pure states.

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