QBism

thumb|Each point in the Bloch sphere|Bloch ball is a possible quantum state for a [[qubit. In QBism, all quantum states are representations of personal probabilities.]] In physics and the philosophy of physics, QBism (pronounced "cubism") is an interpretation of quantum mechanics that takes an agent's actions and experiences as the central concerns of the theory. It is the most prominent and extreme form of quantum Bayesianism, a collection of related approaches that all involve interpreting quantum probabilities as Bayesian in some manner. QBism deals with common questions in the interpretati