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**Quantum theory** may mean:

In science:

- Quantum mechanics: a subset of physics explaining the physical behaviours at the molecular, atomic and sub-atomic levels
- Old quantum theory under the Bohr model or a theory
- Quantum field theory, a generic type of relativistic quantum theory, which includes:
- Quantum gravity, a general term for theories intended to quantize general relativity
- Quantum optics
- Quantum chemistry

In popular culture:

- "Quantum Theory", a song from the Jarvis Cocker album
*Jarvis* *Quantum Theory (video game)*, a 2010 video game by Tecmo

- Introduction to quantum mechanics
- Continuum theories, roughly opposite to quantum theories
- Quantum cognition, using quantum probability theory to model human behavior

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