Why QBism is immune to no-go theorems

In 2012, Pusey, Barrett and Rudolph published a no-go theorem ruling out a class of ontological models for quantum mechanics. In 2015, the first loop-hole free Bell tests confirmed the assumptions of Bell's theorem, the most famous of all no-go theorems. In 2018, Frauchiger and Renner published a no-go theorem based on the Wigner's friend thought experiment. Because each of these no-go theorems, and their many variants, rule out a number of competing interpretations, QBism has emerged significantly strengthened from these developments.

What is the reason QBism is immune to these no-go theorems? It is not that QBism is anti-realist; on the contrary, QBism strongly embraces a form of structural realism. The reason lies in the particular way QBism takes the Born rule to be fundamental. This talk will explain the QBist take on the Born rule and how it resolves the apparent contradictions inherent in some recent versions of the Wigner's friend paradox.