ACM A.M. Turing Award 2025 Winners
ACM conferred the 2025 ACM A.M. Charles H. Bennett of IBM Research and Gilles Brassard of Université de Montréal receive the Turing Award, making scientific history. The couple’s revolutionary quantum information science accomplishments earned them computing’s top prize. Their significant work led to contemporary quantum cryptography, computation, and entanglement protocols.
The 1981 Spark: A Vision of Quantum Reality
This scientific revolution’s history frequently begins on a cold spring day in MIT’s Endicott House in 1981. Nearly fifty of the top computer scientists and physicists in the world convened at the Physics of Computation Conference, which was jointly organized by IBM and MIT, to talk about the convergence of respective disciplines. Richard Feynman proposed that computers used to replicate the physical world should also be quantum, given the physical world is essentially quantum.
Charles Bennett, who captured the conference’s iconic portrait of guests like Freeman Dyson and Paul Benioff, was greatly influenced by Feynman’s vision. Bennett’s exploration of information physics led him to rethink computation as a physical process determined by natural principles, rather than purely a mathematical exercise.
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The Path to Interdisciplinary Mastery
Bennett took an unusual path into quantum informatics because he wanted to fill in the gaps between different disciplines. His initial interest was in biology, but throughout his undergraduate studies, he switched to chemistry and eventually the mathematics and physics of chemistry. As a graduate teaching assistant, he observed a remarkable similarity between Turing machines and the genetic code. He saw that the proteins and enzymes in charge of modifying and duplicating DNA worked similarly to a Turing machine’s cassettes.
Bennett started considering computation as a process controlled by quantum physics and thermodynamics in the early 1970s while working in his first postdoctoral position. The idea that information was only a logical abstraction was called into question by his work. Rather, he maintained that information is physical and had intrinsic limitations that may be converted into technological capabilities.
A Partnership Forged in the Ocean
Bennett’s 1979 ocean meeting with Gilles Brassard at a symposium in San Juan, Puerto Rico, changed the field. Over decades, their team created a new framework for quantum information understanding.
Together, they showed how information might be sent and protected using only quantum processes, particularly the inability to replicate an unknown quantum state without disrupting it. Quantum cryptography was founded on this realization. Their later research on quantum entanglement and teleportation turned philosophical interests into useful tools for quantum computation and sensing.
Quantum Information: The Dream Metaphor
Bennett frequently employs a poetic metaphor that quantum information is like a dream to illustrate the essential distinction between classical and quantum knowledge. The original dream experience is considered private and vulnerable, according to him. When you recount a dream to someone else, you may forget the original and simply recall your description. The “public version” of a dream can be duplicated, but it is not the original. Quantum information is unique in that it cannot be replicated, unlike classical data.
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IBM’s Culture of Exploration
Bennett, who joined IBM in the early 1970s, attributes a large portion of his success to the company’s research culture. IBM at the time gave researchers the “time and space” they needed to investigate basic issues that had no immediate business relevance. In a setting that was uncommon in corporate research, mathematicians and physicists could work together.
A significant turning point was reached in 2016 when IBM deployed the first quantum computer on the cloud with this culture. IBM contributed to the development of a worldwide community of researchers and students by making a 5-qubit device available to the general public. Bennett thinks that increasing “quantum intuition” and educating people about the differences between quantum informatics and classical computing depend heavily on this accessibility.
The Future: Building Quantum Intuition
Bennett contends that as quantum technology develops, quantum information science shouldn’t be limited to experts. In his ideal future, everyone will be familiar with the fundamentals of quantum information, much as society is familiar with relativity or black holes. According to Bennett, the Turing Award is more about the official acknowledgement of information as an essential scientific resource than it is about individual accomplishment.
Often referred to as the “Nobel Prize of Computing,” the ACM A.M. Turing Award now carries a $1.1 million award, with funding from Google. The algorithm and computing using the Turing machine were formally defined by British mathematician Alan Turing, who is honored by the name.
This award, in the larger context of 2026, illustrates the “quantum race’s” explosive acceleration. Although IBM’s 2016 5-qubit cloud device the industry has since shifted toward systems with hundreds or thousands of qubits in an effort to achieve “quantum advantage” in areas like drug development and material research. The acknowledgment of Bennett and Brassard signifies a change in the tech sector from concentrating just on hardware standards to respecting the theoretical underpinnings that enable the hardware to be useful.
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