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=== Quantization of matter ===
=== Quantum radiation, quantum fields ===
Around 1926 Einstein's "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>
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