In science:

*Quantum mechanics, an umbrella term for describing all quantum physics

*Old quantum theory under the Bohr model

* 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

In popular culture:

* "Quantum Theory", the final song from ''Jarvis (album)'', by Jarvis Cocker

* Quantum Theory (video game) is also the name of an upcoming video game

quantum_theory

Source: Wikipedia