Christopher Fuchs

QBism (pronounced cubism) is an interpretation of quantum mechanics that takes an agents actions and personal experiences as the central concerns of the theory.

The philosopher William James once wrote, Like the old woman who described the world as resting on a rock, and then explained that rock to be supported by another rock, and finally said it was ‘rocks all the way down,’ he who believes this to be a radically moral universe must hold the moral order to rest either on an absolute and ultimate should or on a series of shoulds ‘all the way down’.

Recently Cabello (arXiv:1509.04711) introduced a taxonomy of quantum interpretations with regard to what they attempt to say of reality.

Quantum Bayesianism is an effort to interpret all the probabilities arising in quantum theory (our most accurate physical theory to date, the one ultimately responsible for almost all of modern technology) in terms of the Bayesian conception of probability – that probabilities quantify subjective degrees of belief, rather than objective features of nature.