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=== Quantum radiation, quantum fields ===
{{main | History of quantum field theory}}
In 1923 [[Compton scattering|Compton]] demonstrated that the Planck-Einstein energy quanta from light also had momentum. By the "energy quanta" got a new name: it came to be called a "[[photon]]".<ref name="photon-named">{{Cite web|url=https://www.aps.org/publications/apsnews/201212/physicshistory.cfm|title=December 18, 1926: Gilbert Lewis coins "photon" in letter to Nature|website=www.aps.org|language=en|access-date=2019-03-09}}</ref> Despite its role in almost all stages of the quantum revolution, no explicit model for light quanta existed until 1927 when [[quantum electrodyanmics | Dirac]] divided the electromagnetic field into quantum oscillators propagating waves when excited by the motion of charged particles. Over the following decades this work evolved into quantum field theory, the basis for modern [[quantum optics]] and [[particle physics]].
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