Langevin and generalized Langevin types of spontaneous emission of quantum particles |
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Authors: | A M Basharov |
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Institution: | 1.National Research Centre Kurchatov Institute,Moscow,Russia |
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Abstract: | In the effective Hamiltonian representation, we have obtained a quantum stochastic differential equation of a generalized
Langevin type for the evolution operator of an atomic ensemble in a microcavity in an external broadband quantized field and
in a nonresonant field of the microcavity. We show that, depending on the number of particles in the atomic ensemble, its
dynamics demonstrates both the Langevin and the generalized Langevin types of the two-photon spontaneous decay. In this case,
one photon is emitted into the cavity mode, whereas the other photon is emitted into the external broadband electromagnetic
field. The Langevin type is determined by a considerable Stark interaction of the atomic ensemble with the broadband photon-free
quantized field. We show that, here, the Stark interaction is represented by a quantized Poisson process and, depending on
its magnitude (at certain numbers of atoms in the ensemble), the two-photon collective spontaneous emission of microcavity
atoms can be completely suppressed. In this case, the two-photon spontaneous emission of the singly excited atomic ensemble
is described by the two-level model, while the atom-photon cluster of the microcavity under the described conditions is an
artificial two-level quantum particle with a strong Stark interaction. |
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Keywords: | |
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