An information-based approach to quantum mechanics: John A. Wheeler at the Center for Theoretical Physics, UT Austin (1976-1986)

          @misc{ pirsa_PIRSA:25100167,
            doi = {10.48660/25100167},
            url = {https://pirsa.org/25100167},
            author = {Castillo Vergara, Silvia},
            keywords = {Quantum Foundations},
            language = {en},
            title = {An information-based approach to quantum mechanics: John A. Wheeler at the Center for Theoretical Physics, UT Austin (1976-1986)},
            publisher = {Perimeter Institute},
            year = {2025},
            month = {oct},
            note = {PIRSA:25100167 see, \url{https://pirsa.org}}
          }
          

Abstract

At the 1981 Physics of Computation Conference, held at MIT’s Endicott House, **John A. Wheeler** presented a paper entitled **“The Computer and the Universe”** where he put forward the idea of one day understanding ‘physics as information’ (Wheeler 1982). By the early 1980s, it was already well established that information is inseparably tied to physical degrees of freedom and therefore subject to physical law. Yet, several conference presentations advanced the counterpart idea: that physical laws themselves can be viewed as algorithms for information processing, and that their ultimate form must respect the limits of physically executable computation (see Landauer 1982; Fredkin 1982; Kantor 1982; Zuse 1982). After a distinguished career at Princeton, Wheeler joined the University of Texas at Austin in 1976, where he founded the Center for Theoretical Physics. His time there offers a perspective on how the informational turn, highlighted at the 1981 conference, influenced the trajectory of quantum mechanics research in the latter half of the twentieth century. During his time at Texas, Wheeler became intensely focused on the question, **“How come the quantum?”** He sought a deeper principle from which the quantum formalism could be derived. In this search, quantum theory became increasingly intertwined with computing and information theory. As director, he assembled a diverse group of graduate students, postdoctoral fellows, and visiting researchers, creating a dynamic research environment to help tackle this question. The group engaged deeply with emerging developments in computer science—reading widely on parallel computing, Turing machines, cellular automata, and cybernetics—and often held informal seminars where these topics converged with foundational issues in physics, particularly debates on the many-worlds interpretation (Everett, 1957). For Wheeler, the informational turn culminated in his proposal of **“it from bit,”** the idea that every physical entity—every “it”—derives its meaning from fundamental units of information, or “bits” (Wheeler, 1989). For many of the researchers who passed through Austin, this perspective translated into concrete efforts that laid the conceptual and technical groundwork for what would later be recognized as quantum information theory, quantum computation, and novel approaches to the foundations of quantum mechanics. This influence is particularly evident in the work of **David Deutsch** (quantum Turing machines), **William Wootters** (quantum distinguishability and teleportation), **Wojciech Zurek** (decoherence), and **Benjamin Schumacher** (quantum coding), with Wootters and Schumacher together introducing the concept of the qubit. The decade Wheeler spent at Austin provides a fresh perspective on the expanding role of computation and information theory in shaping modern physics in the late twentieth century. Computers were not merely pragmatic tools; they became conceptual models and heuristic devices that that helped steer the direction of research in quantum physics.