coherencekoʊˈhɪər əns, -ˈhɛr-
coherence, coherency, cohesion, cohesiveness (noun)
the state of cohering or sticking together
coherence, coherency (noun)
logical and orderly and consistent relation of parts
Quality of cohering; of being coherent; internal consistency.
a logical arrangements of parts
(of waves) the property of having the same wavelength and phase.
Semantic relationship between different parts of the same text.
In physics, coherence is an ideal property of waves that enables stationary interference. It contains several distinct concepts, which are limit cases that never occur in reality but allow an understanding of the physics of waves, and has become a very important concept in quantum physics. More generally, coherence describes all properties of the correlation between physical quantities of a single wave, or between several waves or wave packets. Interference is nothing more than the addition, in the mathematical sense, of wave functions. In quantum mechanics, a single wave can interfere with itself, but this is due to its quantum behavior and is still an addition of two waves. This implies that constructive or destructive interferences are limit cases, and that waves can always interfere, even if the result of the addition is complicated or not remarkable. When interfering, two waves can add together to create a wave of greater amplitude than either one or subtract from each other to create a wave of lesser amplitude than either one, depending on their relative phase. Two waves are said to be coherent if they have a constant relative phase. The degree of coherence is measured by the interference visibility, a measure of how perfectly the waves can cancel due to destructive interference.
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