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Physical Observers and Quantum Reconstructions
Dorian Daimer, Susanne Still
https://arxiv.org/abs/2506.01561 https://arxiv.org/pdf/25…

Physical Observers and Quantum Reconstructions
There is a multitude of interpretations of quantum mechanics, but foundational principles are lacking. Relational quantum mechanics views the observer as a physical system, which allows for an unambiguous interpretation as all axioms are purely operational, describing the observer's information acquisition. The approach, however, is based on the premise that the observer retains only predictive information about the observed system. Here, we justify this premise using the following principle: P…