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deinonychus commented on the word nonclassical light
Nonclassical light is light that cannot be described using classical electromagnetism; its characteristics are described by the quantised electromagnetic field and quantum mechanics. Nonclassical light has nonclassical noise properties called quantum noise, which can be understood on the basis of quantum optics.
Common described forms of nonclassical light are the following:
Squeezed light exhibits reduced noise in one quadrature component. The most familiar kinds of squeezed light have either reduced amplitude noise or reduced phase noise, with increased noise of the other kind.
Fock states (also called photon number states) have a well defined number of photons (stored e.g. in a cavity), while the phase is totally undefined.
(Wikipedia)
January 15, 2012