Spontaneous emission and lifetime modification caused by an intense electromagnetic field

Details Spontaneous emission and lifetime modification caused by an intense electromagnetic field Spontaneous emission and lifetime modification caused by an intense electromagnetic field

1999-09-14

arxiv.org/abs/quant-ph/9909043v3

Phys. Rev. A 62, 023804 (2000).

Physics

Quantum Physics

25 pages, 6 figures

Scientific paper

10.1103/PhysRevA.62.023804

We study the temporal evolution of a three-level system (such as an atom or a molecule), initially prepared in an excited state, bathed in a laser field tuned at the transition frequency of the other level. The features of the spontaneous emission are investigated and the lifetime of the initial state is evaluated: a Fermi "golden rule" still applies, but the on-shell matrix elements depend on the intensity of the laser field. In general, the lifetime is a decreasing function of the laser intensity. The phenomenon we discuss can be viewed as an "inverse" quantum Zeno effect and can be analyzed in terms of dressed states.

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