Quantum Electrodynamics

Quantum electrodynamics (QED) is the relativistic quantum field theory of electrodynamics. In essence, it describes how light and matter interact and is the first theory where full agreement between quantum mechanics and special relativity is achieved. QED mathematically describes all phenomena involving electrically charged particles interacting by means of exchange of photons and represents the quantum counterpart of classical electromagnetism giving a complete account of matter and light interaction. One of the founding fathers of QED, Richard Feynman, has called it "the jewel of physics" for its extremely accurate predictions of quantities like the anomalous magnetic moment of the electron, and the Lamb shift of the energy levels of hydrogen.

In technical terms, QED can be described as a perturbation theory of the electromagnetic quantum vacuum.

Read more about Quantum Electrodynamics:  History, Mathematics, Renormalizability, Nonconvergence of Series

Other articles related to "electrodynamics, quantum, quantum electrodynamics":

Abraham–Lorentz Force - Background
... In classical electrodynamics, problems are typically divided into two classes Problems in which the charge and current sources of fields are specified and the fields are calculated, and ... One might hope that the transition from classical to quantum-mechanical treatments would remove the difficulties ... While there is still hope that this may eventually occur, the present quantum-mechanical discussions are beset with even more elaborate troubles than the classical ones ...
History Of Quantum Field Theory - History
... Quantum field theory originated in the 1920s from the problem of creating a quantum mechanical theory of the electromagnetic field ... The first reasonably complete theory of quantum electrodynamics, which included both the electromagnetic field and electrically charged matter (specifically, electrons) as quantum ... This quantum field theory could be used to model important processes such as the emission of a photon by an electron dropping into a quantum state of lower energy, a ...
History Of Electromagnetic Theory - 20th Century - Latter Half of The 20th Century
... The first formulation of a quantum theory describing radiation and matter interaction is due to Paul Adrien Maurice Dirac, who, during 1920, was first able to compute the coefficient of spontaneous emission of an atom ... Eugene Wigner, Pascual Jordan, Werner Heisenberg and an elegant formulation of quantum electrodynamics due to Enrico Fermi, physicists came to believe that, in principle, it would ... time, it appeared that a fundamental incompatibility existed between special relativity and quantum mechanics ...
Scale Invariance in Quantum Field Theory - Quantum Electrodynamics
... The QFT describing the interactions of photons and charged particles is quantum electrodynamics (QED), and this theory is not scale-invariant ...
John Clive Ward
... This celebrated result, in quantum electrodynamics, was inspired by a conjecture of Dyson and was disclosed in a one-half page letter typical of Ward's succinct style ... In their recent book entitled Quantum Electrodynamics, Greiner and Reinhardt state in their discussion of charge renormalization "Yet the Ward Identity ...

Famous quotes containing the word quantum:

    But how is one to make a scientist understand that there is something unalterably deranged about differential calculus, quantum theory, or the obscene and so inanely liturgical ordeals of the precession of the equinoxes.
    Antonin Artaud (1896–1948)