Two-level quantum dynamics under time-dependent external fields

James P. Lavine

Vladislav G. Bagrov, J. C. A. Barata, Dmitri M Gitman +1 more

The dynamics of two-level systems in time-dependent backgrounds is under consideration. We present some new exact solutions in special backgrounds decaying in time. On the other hand, following ideas of Feynman et al , we discuss in detail the possibility of reducing the quantum dynamics to a classical Hamiltonian system. This, in particular, opens the possibility of directly applying powerful methods of classical mechanics (e.g. KAM methods) to study the quantum system. Following such an approach, we draw conclusions of relevance for 'quantum chaos' when the external background is periodic or quasi-periodic in time.

Andrea Sacchetti

In this paper we consider a two-level system under the effect of an external time-dependent field. We give a precise criterion for dynamical localization. We then apply our result to the cases of external ac-dc and bichromatic fields.

M. Kira, S. W. Koch

SC Althorpe, Pavel Soldán, Gabriel G. Balint‐Kurti

Eied Mahmoud Khalil, S. Abdel‐Khalek, Waad Albogami +3 more

This paper examines the squeezing on information entropy and entanglement on the basis of a quantum scheme contains two-mode interaction with time dependence of a two-level atom included external field. The proposed model is formulated by eliminating the external field after applying a certain transformation. The dynamics of information entropy squeezing and nonlocal correlation information for the system Hamiltonian are investigated. The influence of the classical field on the evolution of the squeezing and entanglement are estimated. Through the results will obtain the dynamic behavior of squeezing and entanglement is controlled using the external field.