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Search Results: 1 - 10 of 401712 matches for " M. Sebawe Abdalla "
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Enhancement of nonclassical properties of two qubits via deformed operators
N. Metwally,M. Sebawe Abdalla,M. Abdel-Aty
Physics , 2010, DOI: 10.1007/s10773-010-0389-z
Abstract: We explore the dynamics of two atoms interacting with a cavity field via deformed operators. Properties of the asymptotic regularization of entanglement measures proving, for example, purity cost, regularized fidelity and accuracy of information transfer are analyzed. We show that the robustness of a bipartite system having a finite number of quantum states vanishes at finite photon numbers, for arbitrary interactions between its constituents and with cavity field. Finally it is shown that the stability of the purity and the fidelity is improved in the absence of the deformation parameters.
Controlling the quantum computational speed
N. Metwally,M. Abdel-Aty,M. Sebawe Abdalla
Physics , 2008, DOI: 10.1142/S0217979208049029
Abstract: The speed of quantum computation is investigated through the time evolution of the speed of the orthogonality. The external field components for classical treatment beside the detuning and the coupling parameters for quantum treatment play important roles on the computational speed. It has been shown that the number of photons has no significant effect on the speed of computation. However, it is very sensitive to the variation in both detuning and the interaction coupling parameters.
Tripartite entanglement dynamics for atom in a two-mode nonlinear cavity
Mahmoud Abdel-Aty,M. Sebawe Abdalla,Barry C. Sanders
Physics , 2008, DOI: 10.1016/j.physleta.2008.11.036
Abstract: In this communication we introduce a new model which represents the interaction between an atom and two fields injected simultaneously within a cavity including the nonlinear couplers. By using the canonical transformation the model can be regarded as a generalization of several well-known models. We calculate and discuss entanglement between the tripartite system of one atom and the two cavity modes. For a short interaction time, similarities between the behavior based on our solution compared with the other simulation based on a numerical linear algebra solution of the original Hamiltonian with truncated Fock bases for each mode, is shown. For a specific value of the Kerr-like medium defined in this letter, we find that the entanglement, as measured by concurrence, may terminate abruptly in a finite time.
Variance squeezing and entanglement of the XX central spin model
Faisal A. A. El-Orany,M Sebawe Abdalla
Mathematics , 2011, DOI: 10.1088/1751-8113/44/3/035302
Abstract: In this paper, we study the quantum properties for a system that consists of a central atom interacting with surrounding spins through the Heisenberg $XX$ couplings of equal strength. Employing the Heisenberg equations of motion we manage to derive an exact solution for the dynamical operators. We consider that the central atom and its surroundings are initially prepared in the excited state and in the coherent spin state, respectively. For this system, we investigate the evolution of variance squeezing and entanglement. The nonclassical effects have been remarked in the behavior of all components of the system. The atomic variance can exhibit revival-collapse phenomenon based on the value of the detuning parameter.
Single mode quantum properties of the codirectional Kerr nonlinear coupler: frequency mismatch and exact solution
Faisal A. A. El-Orany,M. Sebawe Abdalla,J. Perina
Physics , 2009, DOI: 10.1088/1464-4266/6/11/006
Abstract: In this paper, we investigate the single mode quantum properties of the codirectional Kerr nonlinear coupler when the frequency mismatch is involved and a condition for an exact solution of equations of motion is fulfilled. Particularly, we investigate quadrature and principal squeezing, Wigner function, quadrature distribution, phase distribution and phase variance. We show that the quadrature squeezing and the phase variance can exhibit collapse-revival and collapse-revival-subrevival phenomena, respectively, based on the values of the detuning parameter. Furthermore, we analytically demonstrate that the system can generate cat states, in particular, Yurke-Stoler states.
Squeezing evolution with non-dissipative SU(1,1) systems
Faisal A. A. El-Orany,S. S. Hassan,M. Sebawe Abdalla
Physics , 2009, DOI: 10.1088/1464-4266/5/5/004
Abstract: We investigate the squeezed regions in the phase plane for non-dissipative dynamical systems controlled by SU(1,1) Lie algebra. We analyze such study for the two SU(1,1) generalized coherent states, namely, the Perelomov coherent state (PCS) and the Barut-Girardello Coherent state (BGCS).
Quantum properties of the codirectional three-mode Kerr nonlinear coupler
Faisal A. A. El-Orany,M. Sebawe Abdalla,Jan Perina
Physics , 2009, DOI: 10.1140/epjd/e2005-00048-2
Abstract: We investigate the quantum properties for the codirectional three-mode Kerr nonlinear coupler. We investigate single-, two- and three-mode quadrature squeezing, Wigner function and purity. We prove that this device can provide richer nonclassical effects than those produced by the conventional coupler, i.e. the two-mode Kerr coupler. We show that it can provide squeezing and the quadrature squeezing exhibiting leaf-revival-collapse phenomenon in dependence on the values of the interaction parameters. In contrast to the conventional Kerr coupler two different forms of cat states can be simultaneously generated in the waveguides. We deduce conditions required for the complete disentanglement between the components of the system.
Quantum properties of the parametric amplifier with and without pumping field fluctuations
Faisal A. A. El-Orany,J. Perina,M. Sebawe Abdalla
Physics , 2009, DOI: 10.1016/S0030-4018(00)01114-7
Abstract: The parametric amplifier with and without the pumping fluctuations of coupling function is considered when the fields are initially prepared in coherent light. The pumping fluctuations are assumed to be normally distributed with time-dependent variance. The effects of antibunching and anticorrelation of photons on the photon distribution, correlation between modes and factorial moments are demonstrated. A possible enhancement of photon antibunching for certain values of initial mean photon numbers is shown and discussed. We have shown also that new states (called modified squeezed vacuum states or even thermal states) can be generated from such an interaction. Further, we have demonstrated that the sum photon-number distribution can exhibit collapses and revivals in the photon-number domain somewhat similar to those known in the Jaynes-Cummings model.
Dynamics of impurity, local and non-local information for two non identical qubits
N. Metwally,M. Abdel-Aty,M. Sebawe Abdall
Physics , 2008, DOI: 10.1016/j.optcom.2009.01.027
Abstract: From the separability point of view the problem of two atoms interact with a single cavity mode is investigated. The density matrix is calculated and used to discuss the entanglement and to examine the dynamics of the local and non-local information. Our examination concentrated on the variation in the mean photon number and the ratio of the coupling parameters. Furthermore, we have also assumed that the atomic system is initially in the ground states as well as in the intermediate states. It has been shown that the local information is transferred to non-local information when the impurity of one qubit or both is maximum.
Aquifer Characterization and Groundwater Potential Using Integrated Geoelectric Sounding and Geoinformatics in West Maghagha Area, Minia Governorate, Egypt  [PDF]
Abdulaziz M. Abdulaziz, Abdalla M. Faid
Open Journal of Geology (OJG) , 2017, DOI: 10.4236/ojg.2017.711109
Abstract: The study area is located in the western extension of the Nile Valley near the boundary with the Western Desert, where the groundwater represents the potential water resource for future land development for both industrial purposes and agricultural reclamation. Historically, geoelectric methods proved prospective and practical in exploring for groundwater resources. In this study, 17 Vertical Electric Sounding (VES) were acquired and processed to reveal the subsurface distribution of the water bearing layers and identify the groundwater potential in West Maghagha area. After routine data analysis and calibration, the preliminary results are interpreted in light of the available geological data and indicated the presence of at least four geoelectric layers with model resistivity values up to 2000 Ωm. The potential aquifer was encountered down to ~120 m depth with average thickness of 100 m and is made of argillaceous fractured carbonates. Despite the overall poor quality of this aquifer, the integrated geoelectric and hydrogeologic information indicated a possible potential occurrence of potable groundwater at the southern and northeastern parts of the study area. To improve understanding of the groundwater systems in the study area, detailed aquifer characterization is discussed through integration of the available geologic data, maps, and the geoelectric sections constructed from the VES.
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