Name 
Bennett, Charles H. 
Location

International Business Machines Corporation 
Primary Field

Computer and Information Sciences 
Secondary Field

Applied Physical Sciences 
Election Citation

Bennett's invention of reversible computation is a central result in the fundamental physics of information processing. It led to quantum parallelism and to reversible CMOS logic proposals. His analysis of Maxwell's Demon definitively settled a question posed in 1871. He is coinventor of quantum cryptography and quantum teleportation.

Research Interests

I am a physicist who has specialized in the fundamental physics of information processing, questions such as "Is there a technologyindependent limit to the energy efficiency of computers, like the limit thermodynamics imposes on the efficiency of steam engines?" Somewhat surprisingly, the answer is No: computers in principle can be arbitrarily efficient converters of physical energy into mathematical work. More recently I have participated in extending classical information and computation theory to encompass a subtler kind of information, carried by systems such as single atoms or photons. This information obeys quantum laws, e.g. it exhibits interference, and cannot be copied. Quantum informationprocessing effects, some of which have been demonstrated experimentally, include eavesdropdetecting cryptographic systems, "quantum teleportation," in which an unknown quantum state is disembodied from one particle and recreated in another, and, in principle, dramatically faster ways of solving certain mathematical problems such as factoring large numbers. Besides the physics of computation, I have long been interested in a converse problem  using the tools of information and computation theory to arrive at suitably mathematical, nonanthropocentric measures of a physical system's "complexity," of that which increases when a selforganizing system organizes itself.



