Daniel Greenberger

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Daniel Mordechai Greenberger (born September 29, 1933 in New York City ) is an American physicist.

Greenberger attended Bronx High School with a degree in 1950. He studied physics at the Massachusetts Institute of Technology (MIT) with a bachelor's degree in 1954 (with László Tisza ) and at the University of Illinois at Urbana-Champaign with a master's degree in 1956 and received his doctorate in 1958 from Francis Low . He then spent two years as a cryptologist with the US Army (in a research laboratory that was connected to the NSA ). He was an Assistant Professor at Ohio State University in 1960/61 and then at the University of California, Berkeley in Geoffrey Chew's group . In 1963 he became Assistant Professor and later Associate Professor and in 1979 Professor at City College of New York , where he became Distinguished Professor. From 1990 he was also adjunct professor at Hampshire College in Amherst (Massachusetts) .

1979/80 he was visiting professor at MIT, 1971 visiting scholar at Oxford and 1986 at the University of Vienna.

In the 1960s he dealt with elementary particle physics. His preoccupation with the fundamentals of quantum mechanics began around 1970 when Clifford Shull wanted to use neutrons to test the principle of equivalence , which Greenberger had theoretically proposed as early as the 1960s. Michael Horne was also in Shull's group. At a conference in Grenoble in 1978, he and Horne met Anton Zeilinger , who was then known for his neutron interferometry experiments with his teacher Helmut Rauch . In 1986 all three developed a quantum entangled state of three subsystems named after them (GHZ state). It was first realized experimentally in 1998 ( GHZ experiment ), and represents an improvement over experiments based on Bell's inequality . GHZ states were the first examples of quantum entanglement with more than two particles and play a fundamental role in quantum information theory .

He is a member of the American Association for the Advancement of Science and a Fellow of the American Physical Society . In 1988 he received a Humboldt Research Award with which he was at the Max Planck Institute for Quantum Optics .

Web links

Individual evidence

  1. Life and career data American Men and Women of Science , Thomson Gale 2004
  2. Greenberger, Horne, Zeilinger, Going beyond Bell's Theorem, in: M. Kafatos (Ed.), Bell's Theorem, Quantum Theory, and Conceptions of the Universe, Kluwer, Dordrecht, 1989, pp. 69-72, Arxiv
  3. Dirk Bouwmeester , Jian-Wei Pan , Matthew Daniell, Harald Weinfurter, Anton Zeilinger: Observation of three-photon Greenberger-Horne-Zeilinger entanglement, Phys. Rev. Lett., Vol. 82, 1999, pp. 1345-1349, Arxiv