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Springer series in optical sciences/SPringer series in optical sciences

Exactly Solvable Problems of Atom Interaction with External Electromagnetic Field

Alexander A. Lisyansky, E. S. Andrianov, Alexey P. Vinogradov, Vladislav Yu. Shishkov

Published Jan 1, 2024• 0 citations
Publisher
DOI
10.1007/978-3-031-56638-7_2

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The two basic interaction Hamiltonians for the quantum optical problems, namely the so-called minimal coupling one (p.A) and the multipolar one (d.E) are studied in the dipole approximation. The rigorous and exactly solvable model of an oscillator interacting with the electromagnetic field is employed. The Power-Zienau transformation is discussed. It is concluded that both Hamiltonians lead to the same S-matrix. The existence of an example like the one studied in this paper can be treated as support for the formal proofs given in the literature, which show that both Hamiltonians lead to the same predictions in the case of the more realistic description of the interaction of atoms with photons.
An unified approach to the dynamics of a class encompassing several widely encountered models of a two-level and of a three-level atom interacting with a quantized electromagnetic field is developed. The approach is based on separating the dependence of the dynamics on the field and the atomic operators by expressing the unitary evolution operator in the basis of the atomic operators. The evolution operator then resembles the one for the atoms in an externally applied classical field. The exactly solvable examples of the deterministic, as well as fluctuating, time-dependence of the atom-field coupling are discussed. The issue of an effective two-level description for a three-level system is also analysed. The proposed method not only provides an unified approach to the models belonging to the class considered but is found to uncover several new results even for simple widely studied models.
The Dirac‐Moshinsky oscillator is an elegant example of an exactly solvable quantum relativistic model that under certain circumstances can be mapped onto the Jaynes‐Cummings model in quantum optics. In this work we show, how to do this in detail. Then we extend it by considering its coupling with an external (isospin) field and find the conditions that maintain solvability. We use this extended system to explore entanglement in relativistic systems and then identify its quantum optical analog: two different atoms interacting with an electromagnetic mode. We show different aspects of entanglement which gain relevance in this last system, which can be used to emulate the former.