Roy J. Glauber (1925-2022) was an American physicist renowned for his work in the field of quantum optics. He played a pivotal role in developing the theory of coherence and the quantum theory of optical coherence, for which he was awarded the Nobel Prize in Physics in 2005, alongside John L. Hall and Theodor W. Hänsch.
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Roy J. Glauber developed a quantum description of photon statistics and optical coherence. His 1963 paper uses coherent states to represent quantum states of the radiation field and relate them to field-correlation measurements. The coherent states form a complete set despite being nonorthogonal. This provides a useful bridge to classical field descriptions while preserving distinctions between quantum and classical photon statistics, rather than characterizing light only by its mean intensity.[ref]
Coherent and Incoherent States of the Radiation Field by Roy Jay Glauber. Abstract: photon statistics, coherent-state completeness and radiation-field density-operator representations
A physicist working on the quantum theory of optical coherence.[ref]
Professional profile of Roy Jay Glauber. Independent professional identity
Portrait of Roy J. Glauber
. Markus Pössel (User name: Mapos); Lindau Nobel Laureate Meeting, 4 July 2012. CC BY-SA 3.0, via Wikimedia Commons. Source.