QBism and the Greeks: why a quantum state does not represent an element of physical reality

Abstract

In QBism (or Quantum Bayesianism) a quantum state does not represent an\nelement of physical reality but an agent's personal probability assignments,\nreflecting his subjective degrees of belief about the future content of his\nexperience. In this paper, we contrast QBism with hidden-variable accounts of\nquantum mechanics and show the sense in which QBism explains quantum\ncorrelations. QBism's agent-centered worldview can be seen as a development of\nideas expressed in Schr\\"odinger's essay "Nature and the Greeks".\n