We have studied stationary and quasi-stationary signal light pulses in cold -type atomic media driven by counterpropagating control laser fields at the condition of electromagnetically induced transparency. By deriving a dispersion relation we present spectral and temporal properties of the signal light pulse and a significant influence of atomic decoherence on the coupled stationary light pulses for spatial splitting. Finally we discuss quasi-stationary light pulse evolution characterized by frozen spatial spreading for a robust coherent control of slow light pulses. PACS numbers: 42.50.Dv, 42.50.Gy, 03.67.Mn Introduction Quantum coherence control and deterministic manipulation of light pulses have become a topical issue in optics and optical quantum information science. Herein, using electromagnetically induced transparency (EIT) effect [1] is one of the promising tools for the coherent control of weak light fields even in a single photon level [2,3]. This technique is intensively elaborated for various applications of EIT-based quantum memories [4,5] and generation of nonclassical light fields [6].EIT-based quantum coherence control of weak lights is a strong candidate for ultralow power nonlinear optics [7] applicable to quantum information science such as implementation of two-qubit gates in the optical quantum computing [8][9][10][11][12][13][14]. Using stationary light pulse (SLP) concept proposed recently under the EIT condition [15][16][17][18][19][20] seems to be especially prospective for this purpose due to prolonged lifetime of the slow light pulses in the atomic media. The SLP coherent control with two counterpropagating light fields has been initially demonstrated in a hot atomic gas [15] and in solids [21]. Later this basic scheme was studied for the cold atomic systems in a series of works [22][23][24][25][26][27][28][29][30][31].Herein, the two counterpropagating control light fields lead to the excitation of many spatial gratings and long-lived atomic coherences [22,23,25]. The coherence gratings can results in the signal light dynamics of splitting the input light pulse into two counter-propagating light pulses [22,[24][25][26]29].Recent numerical studies [27][28][29] of nonadiabatic effects in SLP dynamics have revealed strong negative influence of the multiply excited coherence gratings on the SLP [30][31]. However the spectral and temporal properties of SLP remains insufficiently elaborated for SLP outside of the
The aim: To study possibilities of prognosis of pathological wear of tooth hard tissues development depending on the functional activity of masticatory muscles. Materials and methods: In order to achieve the goal of the study, a survey of patients at the age of 19 to 69 years was conducted for precision of number of persons who have increased tooth wear. During the examination of all patients, three groups were selected: control and two researched ones. Patients in the control group (30 patients between the age of 18 and 60 years old) had an intact dentition without any visible sign of increased tooth wear. The researched groups included 25 patients aged from 18 to 60 years old. The second research group included patients who had increased tooth wear of I-III level. The children of the patients of the II group with or without any sign of increased tooth wear were referred to the third research group. Results: The method of electromyography was performed for the study of peculiarities of the muscular activity of the maxillofacial area of the patients of the control and research groups. In our opinion, all manifestations of increased tooth wear are related to changes in the muscle system, the motor apparatus and the nervous activity of an organism. Conclusions: The study of direct muscular apparatus and related bone system may predict the possibility of developing of an increased tooth wear of young patients in the future and prevent its development, as well as to justify the application of a prevention and treatment plan of the studied pathology.
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