Why QBism is not the Copenhagen interpretation and what John Bell might have thought of it

Abstract

Christopher Fuchs and Rüdiger Schack have developed a way of understanding science, which, among other things, resolves many of the conceptual puzzles of quantum mechanics that have vexed people for the past nine decades. They call it QBism. I speculate on how John Bell might have reacted to QBism, and I explain the many ways in which QBism differs importantly from the orthodox ways of thinking about quantum mechanics associated with the term "Copenhagen interpretation."

14 pages. Based on a talk at the conference "Quantum [Un]Speakables II: 50 Years of Bell's Theorem", University of Vienna, June 19, 2014