quantum field theory

noun Physics.
any theory in which fields are treated by the methods of quantum mechanics; each field can then be regarded as consisting of particles of a particular kind, which may be created and annihilated.

Origin:
1945–50

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Collins
World English Dictionary
quantum field theory
 
n
physics quantum mechanical theory concerned with elementary particles, which are represented by fields whose normal modes of oscillation are quantized

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American Heritage
Science Dictionary
quantum field theory  
The application of quantum mechanics to physical systems described by fields, such as electromagnetic fields. Quantum field theory was developed to overcome certain deficiencies in Schrödinger's equation, in particular the fact that it was not consistent with special relativity and was difficult to apply to systems involving many particles or to the creation and destruction of particles. See also quantum chromodynamics, quantum electrodynamics.

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Example sentences
His specialties include quantum field theory and mathematical physics.
Unfortunately, the electroweak model suffered from the same problems in
  prediction as the quantum field theory.
Your first comment seems to be a vision of some type of quantum field theory.
There is now work predicting fusion from quantum field theory, applied to
  physical configurations that weren't anticipated.
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