Abstract:
During the early days of quantum mechanics there was an intense debate about the completeness of the theory between Bohr and Einstein. Einstein being the father of the theory of relativity realised something spooky was happening between entangled systems that were spacelike separated, while Bohr being one of the fathers of quantum mechanics insisted that this was a feature of quantum mechanics that we had to reconcile with. In this talk I introduce the framework of ontological models to give a mathematical description of their debate. I follow the historical timeline of the debate to then revise the Bell theorem with an enlightening thought experiment, and finish with a revision of the PBR theorem and its consequences for the ontology of the quantum state.