Quantum leap

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In physics, a quantum leap or quantum jump is a change of an electron from one quantum state to another within an atom.[1] It appears to be discontinuous; the electron "jumps" from one energy level to another very quickly, after existing briefly in a state of superposition. The time this takes relates to the natural, pressure and field broadening of spectral lines. Quantum leaps cause the emission of electromagnetic radiation, including that of light, which occurs in the form of quantized units called photons. Their statistics is Poissonian and the damping is exponential (in average)[2].

Although changes of quantum state occur on the submicroscopic level, in popular discourse, the term "quantum leap" refers to a large increase (Oxford English Dictionary).

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