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Fermi's golden rule

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Fermi's golden rule

formula that describes the transition rate from one energy eigenstate of a quantum system into other energy eigenstates

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About Fermi's golden rule

In quantum physics, Fermi's golden rule is a formula that describes the transition rate from one energy eigenstate of a quantum system to a group of energy eigenstates in a continuum, as a result of a weak perturbation. This transition rate is effectively independent of time and is proportional to the strength of the coupling between the initial and final states of the system as well as the density of states. It is also applicable when the final state is discrete, i.e. it is not part of a continuum, if there is some decoherence in the process, like relaxation or collision of the atoms, or like noise in the perturbation, in which case the density of states is replaced by the reciprocal of the decoherence bandwidth.

Facts from Wikidata (CC0). Image by Jacopo Bertolotti via Wikimedia Commons (CC0).

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