Charles H. Bennett

from Wikipedia, the free encyclopedia

Charles Henry Bennett (* 1943 ) is an American physicist and computer scientist . He is one of the discoverers of quantum teleportation .

life and work

Bennett was the son of two music teachers. He graduated from Brandeis University with a bachelor's degree in chemistry in 1964 and received his PhD from Harvard University in 1970 with David Turnbull and Bernie Alder with a thesis on molecular dynamics. As a post-doctoral student he was with Aneesur Rahman at the Argonne National Laboratory . From 1972 he was in research at IBM . Bennett is an IBM Fellow and works at the IBM Thomas J. Watson Research Center . From 1983 to 1985 he was visiting professor of computer science at Boston University .

He did research in particular on the relationship between physics and information and, more recently, in the field of quantum information processing ( quantum cryptography ).

In 1973, building on the work of Rolf Landauer (1961), he showed that a universal computer is possible that works thermodynamically reversibly (and must also be logically reversible for this purpose), i.e. does not generate any (or any small) entropy. In 1982 he proposed a reinterpretation of Maxwell's demon , whose principle failure to break the Second Law, according to Bennett, is not the cost of obtaining information, but the cost of destroying information.

In 1984, together with Gilles Brassard , he proposed the BB84 protocol for quantum key exchange named after the two , the first such method. He demonstrated the practicality in 1989 with John A. Smolin

In 1993 he discovered quantum teleportation with William Wootters , Asher Peres , Gilles Brassard , Claude Crépeau and Richard Jozsa . With Smolin, Wootters, David DiVincenzo and others, he developed the quantum entanglement theory quantitatively from 1995 to 1997 and developed methods of transferring information via classical and quantum mechanical noisy channels.

He also dealt with algorithmic information theory and defined an inner complexity ( logical depth ) of physical states as the time it takes a universal computer to generate the state from a random initial state.

He is a Fellow of the National Academy of Sciences and the American Physical Society . In 2008 he received the Harvey Prize of the Technion in Israel, in 2017 the Dirac Medal (ICTP) and in 2018 the Wolf Prize for Physics. Bennett was awarded the BBVA Frontiers of Knowledge Award for 2019 and the Claude E. Shannon Award for 2020 .

He is married and has three children. His hobbies are photography and music.


  • 1973: Logical Reversibility of Computation . IBM J.Res. Dev., Vol. 17. pp. 525-532.
  • 1982: The Thermodynamics of Computation . Boarding school Journal Theor. Phys. 21 pp. 905-940.
  • 1987: Demons, engines and the second law . Scientific American. 257. pp. 108-116.

See also

Web links

Individual evidence

  1. ^ Bennett, Brassard: Quantum Cryptography: Public key distribution and coin tossing . In: Proceedings of the IEEE International Conference on Computers, Systems, and Signal Processing. Bangalore, 1984, p. 175
  2. ^ Charles H. Bennett, Francois Bessette, Gilles Brassard, Louis Salvail, John Smolin Experimental Quantum Cryptography , J. of Cryptology 5, 3-28 (1992)
  3. ^ CH Bennett, Gilles Brassard, Claude Crepeau, Richard Jozsa, Asher Peres and WK Wootters: Teleporting to Unknown Quantum State via Dual Classical and Einstein-Podolsky-Rosen Channels . In: Physical Review Letters. Volume 70, 1993, p. 1895
  4. The BBVA Foundation recognizes Charles H. Bennett, Gilles Brassard and Peter Shor for their fundamental role in the development of quantum computation and cryptography., March 3, 2020, accessed on March 3, 2020 .