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 electrodynamics
Quantum chromodynamics
Electroweak interaction
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, a 2010 video game by Tecmo
See also
Introduction to quantum mechanics
Continuum theories, roughly opposite to quantum
theories
Quantum cognition, using quantum probability
theory to model human behavior
