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Quantum field theory extends quantum mechanics to encompass fields and particles as excitations of these fields from "summary" of Simply Quantum Physics by DK
Quantum field theory is an extension of quantum mechanics that broadens its scope to include not just particles, but also the fields in which these particles exist. In classical physics, fields are continuous regions of influence that can exert forces or other effects on objects within them. The concept of fields was first introduced to physics by Michael Faraday in the 19th century, and later developed by James Clerk Maxwell in his theory of electromagnetism. In quantum field theory, fields are seen as the fundamental entities of nature, with particles being viewed as excitations or disturbances within these fields. This means that particles are not separate entities moving thro...
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