Bob Henderson in Nautilus:
I botched my first interview with Chris Fuchs. Fuchs is a physicist at the University of Massachusetts Boston and the leading proponent of QBism, one of the newest and most controversial of quantum theory’s many interpretations. It goes something like this: Quantum mechanics, the theory physicists use to predict the behavior of elementary particles like electrons and photons that make up matter and light, doesn’t actually pertain to particles, but rather to the beliefs about them of whoever is using the theory. And if several people are using it at the same time? Then QBism says that each of them is entitled not only to their own beliefs, but to their own facts.
It was August 2020 and Fuchs and I were talking over Zoom. He was slumped in a stuffed armchair, sporting wire-rimmed glasses and pandemic-long hair. He’d insisted I educate myself about QBism before talking to me, and had sent me 17 links to articles, interviews, and videos. Now he was regaling me with an anecdote-filled story of his career when I blurted out the question that had been bugging me all along, which was essentially, “How the hell could that be right?”