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In physics, quantum theory is a term that may be used to refer to several related types of theories which make use of quanta:

• Old quantum theory under the Bohr model, early attempts to derive results from quantization of action
• Quantum mechanics, a term used to refer to all theories using quanta, or specifically to the non-relativistic quantum 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

For a general introduction to the subject, see introduction to quantum mechanics.

cs:Kvantová teorie

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