Christopher A. Fuchs is a theoretical physicist, the founder, a pioneer and the most ardent proponent of QBism, which he first introduced with his PhD advisor Carlton Caves in the form of "Quantum Bayesianism",[1] but later developed into his own version for which he introduced the term QBism.[2] In a footnote of the abstract of this paper, he states that:
Quantum Bayesianism, as it is called in the literature, usually refers to a point of view on quantum states originally developed by C. M. Caves, C. A. Fuchs, and R. Schack. The present work, however, goes far beyond those statements in the metaphysical conclusions it draws—so much so that the author cannot comfortably attribute the thoughts herein to the triumvirate as a whole. Thus, the term QBism to mark some distinction from the known common ground of Quantum Bayesianism. Needless to say, the author takes sole responsibility for any inanities herein.
He is a peculiar character, an iconoclast and independent thinker. He writes with a literary style which makes his work sometimes more literature than scientific discourse. Read him, for instance, saying that « when we take a moment and ask—whether in a dorm room or the pages of a philosophy journal—what the theory is all about, we find ourselves thrashing about in decades of accumulated murk.»[3] His private emails have been published.[4] He is particularly fond of puns and clever constructs.
According to Cavalcanti, «What makes Fuchs’s contribution unique is that he is one of the few who take the details of that philosophy very seriously and follow them to what seem to be their ultimate consequences.»
According to Greenberger, «He has become something that was once common, but is today very rare: a writer of thoughtful letters (through email), and a direct descendent of the great letter writers of old, who would publish their fasci- nating private diaries and letters. He is a modern, old-fash- ioned diarist. »