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Search Results: 1 - 10 of 402742 matches for " M. Abdel-Aty "
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Delayed creation of entanglement in superconducting qubits interacting with a microwave field
M. Abdel-Aty,M. Everitt
Physics , 2009, DOI: 10.1140/epjb/e2010-00056-y
Abstract: We explore the role played by the intrinsic decoherence in superconducting charge qubits in the presence of a microwave field applied as a magnetic flux. We study how the delayed creation of entanglement, which is opposite to the sudden death of entanglement, can be induced. We compute the time evolution of the population inversion, total correlation and entanglement, taking into account the junction mixed state and dissipation of the cavity field. We show that although decoherence destroys the correlation of the junction and field, information of the initial state may be obtained via quasi-probability distribution functions.
Linear Entropy of a Driven Central Spin Interacting with an Antiferromagnetic Environment  [PDF]
Mahmoud Abdel-Aty
Natural Science (NS) , 2014, DOI: 10.4236/ns.2014.67052
Abstract:

We exploit a scheme to obtain a long-lived entanglement using a driven central spin interacting with an antiferromagnetic spin bath. Our numerical results show the effects of different parameters on the population inversion and the entanglement dynamics in terms of the linear entropy. It is shown that the long-lived entanglement is an intriguing result corresponding to the collapse region of the atomic inversion. As illustration, we examine the long-time interaction of the entanglement under the resonance and off-resonance regimes.


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.
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.
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.
Reply to Comment on "Quantum inversion of cold atoms in a microcavity: spatial dependence"
M. Abdel-Aty,A. -S. F. Obada
Physics , 2003, DOI: 10.1088/0953-4075/37/8/N01
Abstract: The question raised by [Bastin and Martin 2003 J. Phys. B: At. Mol. Opt. Phys. 36, 4201] is examined and used to explain in more detail a key point of our calculations. They have sought to rebut criticisms raised by us of certain techniques used in the calculation of the off-resonance case. It is also explained why this result is not a problem for the off-resonance case, but, on the contrary, opens the door to a general situation. Their comment is based on a blatant misunderstanding of our proposal and as such is simply wrong.
Geometric phase of a moving three-level atom
S. Abdel-Khalek,Y. S. El-Saman,M. Abdel-Aty
Physics , 2009, DOI: 10.1016/j.optcom.2009.12.065
Abstract: In this paper, we investigate the geometric phase of the field interacting with $\Xi $-type moving three-level atom. The results show that the atomic motion and the field-mode structure play important roles in the evolution of the system dynamics and geometric phase. We test this observation with experimentally accessible parameters and some new aspects are obtained.
Toxicity of Pesticide Industrial Wastewater to the Green Alga Scenedesmus obliquus: A Case Study
A.M. Abdel-Aty,M.A. El-Dib,M.I. Badawy
Pakistan Journal of Biological Sciences , 2006,
Abstract: Algal bioassay using Scenedesmus obliquus was an efficient procedure to evaluate the toxicity of wastewaters generated by pesticide industry. Toxicity of raw and wastewaters treated by advanced oxidation processes namely Fenton and Photo-fenton reactions were tested. The study revealed the toxic effect of wastewater in terms of Chl (a) content, EC50 value, carbohydrate and protein contents of algae. The toxic effect was increased by increasing the ratio of the wastewater in the algal culture. The EC50 values at 96 h were 1.8, 8 and 8% for the raw, Fenton and Photo-fenton treated wastewater, respectively; indicating the improvement in wastewater quality. This trend matches that indicated by the high percentage removal of pesticides residues (92-97%) and increased BOD/COD ratio for the wastewater treated by the advanced oxidation processes.
Entangled states generation of two atoms interacting with a cavity field
F. N. M. Al-Showaikh,N. Metwally,M. Abdel-Aty
Physics , 2009,
Abstract: We classify different classes of entangled states arise in a two-qubit system. Some of these classes are of Bell's state types, while others are of the Werner's state types. The degree of entanglement is quantified for different values of the atomic and the cavity parameters. We show that it is possible to generate entangled state with high degree of entanglement by controlling the detuning and the number of photon inside the cavity.
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