Daniel Greenberger

Daniel M. Greenberger
Born	1932
Residence	NYC
Nationality	United States
Fields	Physicist
Institutions	City College of New York
Alma mater	Massachusetts Institute of Technology University of Illinois
Doctoral advisor	Francis E. Low
Known for	Quantum Entanglement Greenberger–Horne–Zeilinger state

Daniel M. Greenberger (born 1932) is an American quantum physicist. He has been professor of physics at the City College of New York since 1964. He is also a fellow of the American Physical Society and—alongside Anton Zeilinger—founded the APS Topical Group on Quantum Information.

Daniel Greenberger graduated in 1950 from the Bronx High School of Science. He then graduated in 1954 from MIT, where he conducted his thesis under Laszlo Tisza. He received his MS (1956) and PhD (1958) from the University of Illinois, where his advisor was Francis E. Low.

After graduation, he spent two years in the US Army at a physics research lab connected to the NSA, working as s a cryptanalyst, which eventually sparked his interest in quantum cryptography.

From 1961 to 1963 he was a postdoctoral fellow at UC Berkeley in Geoffrey Chew's high-energy theory group. In 1964, he became a faculty member at the City College of New York. Greenberger soon became interested in gravity. Around 1970, he went to MIT to see Clifford Shull to test the equivalence principle with neutrons from the university's reactor. As the reactor had been down for maintenanc, Roberto Collela, Albert Overhauser, and Sam Werner devised a better way to do the experiment using a neutron interferometer.

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