We study the dispersion and absorption spectra of a weak probe in a L-type three-level atomic system with closely ground sublevels driven by a strong field and damped by a broadband squeezed vacuum. We analyze the interplay between the spontaneous generated coherence and the squeezed field on the susceptibility of the atomic system. We find that by varying the intensity of the squeezed field th...

We study procedures for the optimization of efficiency of light storage and retrieval based on the dynamic form of electromagnetically induced transparency in hot Rb vapor. We present a detailed analysis of two recently demonstrated optimization protocols: a time-reversal-based iteration procedure, which finds the optimal input signal pulse shape for any given control field, and a procedure bas...

F. Heidler Z. Flisowski University of the Federal Armed Forces Munich, Germany University of Technology Warsaw, Poland [email protected] [email protected] W. Zischank Ch. Bouquegneau University of the Federal Armed Forces Munich, Germany Faculté Polytechnique de Mons, Belgium [email protected] [email protected] C. Mazzetti University “La Sapienza”...

Current-voltage measurements in electrical impedance tomography (EIT) can be partially ordered with respect to definiteness of the associated self-adjoint Neumann-to-Dirichlet operators. With this ordering, a pointwise larger conductivity leads to smaller current-voltage measurements, and smaller conductivities lead to larger measurements. We present a converse of this simple monotonicity relat...

A hypothesis about what is the principal cognitive precondition of successful systematic acquainting children with computers is put forward. For this, the notion of the Thought-Producing Self of the child is introduced. It is stated that the System of Emotional-Imaginative Teaching (EIT-system) based on the Theory of Dynamic Conceptual Mappings allows for realizing the Thought-Producing Self of...

We suggest a technique for producing subfemtosecond pulses of radiation. The technique is based on using electromagnetically induced transparency to produce a strongly driven molecular coherence. This coherence results in a Raman spectrum with Bessel function amplitudes and phases corresponding to a frequency modulated signal, thereby allowing compression by the group velocity dispersion of the...

In this paper we show that rotational invariance can be improved in a neural network based EIT reconstruction approach by a suitably chosen permutation of the input data. The input space is partitioned to non-overlapping sectors, and the input signal is permuted so that it lies in one sector independent of the original rotation angle. We demonstrate the advantages of the method with computer si...

Calculating test validity as an instrument of educational achievement level determination, is one of the main research tasks, especially on a state level. The system of HEI admission must be based on the principles of fairness and openness. This can only be achieved by conducting systematic admission test result analysis both in the context of organization processes and within the assessment of...

We analyze both experimentally and theoretically the phase shift of a fixed coupling laser field in a L-type system induced by a tunable probe laser field. The measurements are performed with a heterodyne interferometer on a beam of cesium atoms in the D2 line. This system exhibits electromagnetically induced transparency with a rapidly varying refractive index. The parametric dispersion of the...