LYCOS RETRIEVER 
Quantum Theory: Fields
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Like classical physics, quantum theory sometimes describes light as a wave, because light behaves like a wave in many situations. Light is not a vibration of a solid substance, such as a rope. Instead, a light wave is made up of a vibration in the intensity of the electric and magnetic fields that surround any electrically charged object.
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With not just one, but two complete formulations of quantum mechanics in hand, the quantum theory grew explosively. It was applied to atoms, molecules, and solids. It solved with ease the problem of helium that had defeated the old quantum theory. It resolved questions concerning the structure of stars, the nature of superconductors, and the properties of magnets. One particularly important contributor was P.A.M. Dirac, who in 1926 (at age 22) extended the theory to relativistic and field-theoretic situations.
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This classic introduction to electromagnetic fields, thoroughly revised in 1964 and available here in a one-volume edition, includes a self-contained section on quantum theory. Problems with solutions. 148 illustrations. 1964 edition. read more
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The field has become so active that there are a number of Web sites devoted exclusively to topics in quantum information theory. Most are maintained reasonably current, and ... provide an easy means for staying abreast of new developments.
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In this chapter the basic definition of the quantum theory of fields will be presented, following what are essentially traditional lines. The point of view adopted here regarding the nature of the quantum theory is essentially the traditional one, on a conceptual level, although the mathematical tools used are not those commonly employed in the usual presentation of the subject. It is important to point out that this point of view is provisional, and will have to be changed, to some extent, later on.
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