quantum theory
US /ˈkwɑːntəm ˈθiːəri/
UK /ˈkwɑːntəm ˈθiːəri/
1.
a theory of matter and energy based on the concept of quanta, especially quantum mechanics and quantum field theory.
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Quantum theory revolutionized our understanding of the universe at the atomic and subatomic levels.
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Many physicists are still working on extending and refining quantum theory.