Atomic entropy and its squeezing are investigated for an intensely driven two-level atom in the presence of a broadband-squeezed vacuum field. Specifically, the effect of the field-dependent atomic decay parameter combined with the initial atomic coherent state is examined in detail. PACS No: 42.50.HZ Résumé : Nous étudions l'entropie atomique et sa compression dans un atome à deux niveaux intensément excité en prés-ence d'un champ du vide comprimé à large bande. Plus précisément, nous étudions en détail l'effet du paramètre de désin-tégration atomique dépendant du champ, en combinaison avec l'état atomique cohérent initial. [Traduit par la Rédaction]
The steady state behavior of a bistable system of a homogeneously or inhomogeneously broadened two sorts of two-level atoms placed in a ring cavity and driven by a coherent field is analyzed within the mean field limit where the transverse effect of the radiation field is taken into account within the single-transverse-mode model. Effects on the input–output relation, due to the transverse parameter and the Lorentzian and the Gaussian line widths which measure the inhomogeneous broadening of the atoms, are examined. The enlargement of the optical bistable (tristable) region according to the previously mentioned parameters is explained.
We consider a two-mode quantized field described in a coherent state interacting with a four-level atom. An effective Hamiltonian is obtained by adiabatically eliminating the intermediate two levels in a cascade process. The influence of the Stark shifts and the Kerr-like medium on the atomic inversion are examined, as well as on the field entropy, atomic purity and Mandel's Q-parameter. The results of the calculations are illustrated numerically.
In this article the effect of intensity-dependent coupling and the atomic dissipation on the interaction of a pair of three-level atoms in the Ξ configuration with a bi-mode cavity field are studied. The solution of the proposed model is obtained in the resonance case. Some statistical quantities are discussed to discover the characteristics of the model. With different nonlinearity functions, the population inversion and the photon number dynamics, which display the phenomenon of collapses and revivals are discussed. The non-classical effects by examining the Mandel Q-parameter are considered. The amount of correlation between the two atoms and the field is estimated by analyzing the results of the fidelity.
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