Rolf Landauer

Rolf William Landauer
Landauer September 1969
Born	(1927-02-04)February 4, 1927 Stuttgart, Germany
Died	April 27, 1999(1999-04-27) (aged 72)[1] Briarcliff Manor, New York, U.S.
Nationality	German American
Alma mater	Stuyvesant High School Harvard University
Known for	Landauer's principle Landauer formula
Awards	Stuart Ballantine Medal (1992) Oliver E. Buckley Prize (1995) Edison Medal (1998)
Scientific career
Fields	Physicist
Institutions	NASA IBM
Thesis	Phase Integral Approximations in Wave Mechanics: I. Reflections in One-Dimensional Wave Mechanics. II. Phase Integral Approximations in Two and Three Dimensions.  (1950)
Doctoral advisor	Léon Brillouin Wendell Furry

Rolf William Landauer (February 4, 1927 – April 27, 1999) was a German-American physicist who made important contributions in diverse areas of the thermodynamics of information processing, condensed matter physics, and the conductivity of disordered media.^[2] Born in Germany, he emigrated to the U.S. in 1938, obtained a Ph.D. in physics from Harvard in 1950, and then spent most of his career at IBM.

In 1961 he discovered Landauer's principle, that in any logically irreversible operation that manipulates information, such as erasing a bit of memory, entropy increases and an associated amount of energy is dissipated as heat.^[2] This principle is relevant to reversible computing, quantum information and quantum computing. He also is responsible for the Landauer formula relating the electrical resistance of a conductor to its scattering properties. He won the Stuart Ballantine Medal of the Franklin Institute, the Oliver Buckley Prize of the American Physical Society and the IEEE Edison Medal, among many other honors.^[2]