Sul Paradosso di Frauchiger e Renner: Auto-Consistenza della Meccanica Quantistica

In 2018 the two physicists Daniela Frauchiger and Renato Renner published the paper entitled "Quantum theory cannot consistently describe the use of itself", proposing a thought-experiment to discuss the foundations of quantum mechanics. In particular, their work takes into account three natural-sounding assumptions such as the universality of the theory, its consistency and the unicity of the outcome in an experiment performed by a single agent. In my work I analyzed Frauchiger and Renner's formulation of their paradox. The FR paradox leads to a No-Go theorem for standard quantum mechanics and forces to take seriously its foundations despite its brilliant empirical validity. In this work, we discuss its validity from within some existing interpretations of quantum mechanics - that for this reason we should call theories - Bohmian mechanics, GRW and many worlds theories. We will be referring to these as quantum theories without observers. In fact, we will discuss the way FR paradox is actually not able to avoid the problem posed by Wigner within standard quantum mechanics, that can be avoided only as soon as we develop a theory for which the role of observers and measurements are defined from within the theory itself, at the opposite of standard quantum mechanics approach.