mahmoud.abdelatty

محمود محمد أحمد عبدالعاطى

استاذ - أستاذ

كلية العلوم

العنوان: Sohag, 15 Str

17

إعجاب
2007 | الكلمات المفتاحية photonic, bandgaps, a three-level atom, Quantum information,
Quantum information of a three-level atom in one-dimensional photonic bandgaps
In this paper a novel analytical method is applied to the problem of investigating the fidelity and linear entropy of a three-level system in the presence of a photonic band gap. Using this analytic solution, we conclusively calculate the fidelity and linear entropy, related particularly to the entanglement phenomena. We demonstrate how fluctuations in the fidelity and linear entropy are ... إقراء المزيد

2007 | الكلمات المفتاحية coherent state, Entropy,
Information entropy of a Holstein-Primakoff SU(1,1) coherent state
We present a general framework for the quasi-mutual entropy to quantify the entanglement degree for a two-level atom interacting with a Holstein-Primakoff SU(1,1) coherent state, taking into account an arbitrary form of the intensity-dependent coupling. We derive an explicit expression for the entanglement degree in terms of the density matrix elements which does not involve the diagonal approximation, and establish ... إقراء المزيد

2007 | الكلمات المفتاحية information entropy, A LASER FIELD, dependent three-level trapped,
Information entropy of a time-dependent three-level trapped ion interacting with a laser field
Trapped and laser-cooled ions are increasingly used for a variety of modern high-precision experiments, frequency standard applications and quantum information processing. Therefore, in this communication we present a comprehensive analysis of the pattern of information entropy arising in the time evolution of an ion interacting with a laser field. A general analytic approach is proposed for a three-level trapped-ion system ... إقراء المزيد

2005 | الكلمات المفتاحية Qualitative aspects, Entanglement, three-level model, Photonic crystals,
Qualitative aspects of the entanglement in the three-level model with photonic crystals
This communication is an enquiry into the circumstances under which concurrence and phase entropy methods can give an answer to the question of quantum entanglement in the composite state when the photonic band gap is exhibited by the presence of photonic crystals in a three-level system. An analytic approach is proposed for any three-level system in the presence of photonic ... إقراء المزيد

2005 | الكلمات المفتاحية von Neumann Mutual,
von Neumann Mutual Information for Anisotropic Coupled Oscillators Interacting with a Single Two-Level  Atom
We consider the interaction between a two-level atom and two electromagnetic fields injected simultaneously within a cavity, with the interaction between the fields in parametric frequency-converter form. The wave function in Schr ödinger picture is obtained under certain conditions and consequently the density matrix. By employing a generalization of the von Neumann mutual information (in the context of Tsallis' nonextensive ... إقراء المزيد

2005 | الكلمات المفتاحية SCHRÖDINGER CAT STATES, ATOM-FIELD INTERACTION, QUANTUM PARTIAL ENTROPIES,
A TREATMENT OF THE QUANTUM PARTIAL ENTROPIES IN THE ATOM-FIELD INTERACTION WITH A CLASS OF SCHRÖDINGER CAT STATES
This paper is an enquiry into the circumstances under which entropy and subentropy methods can give an answer to the question of quantum entanglement in the composite state. Using a general quantum dynamical system, we obtain the analytical solution when the atom initially starts from its excited state and the field in different initial states. Different features of the entanglement ... إقراء المزيد

2005 | الكلمات المفتاحية Phase entropy, a single trapped ion, A LASER FIELD,
Phase entropy of a single trapped ion interacting with a laser field
This contribution explores the perceptions, ideas and understanding about the phase entropy of the ion-field interaction. Here we discuss the interaction between a single qubit (trapped ion) and a single laser field. We construct the explicit solution of this problem. Employing an obtained exact solution of the problem, significant features of the phase entropy in the context of the measure ... إقراء المزيد

2005 | الكلمات المفتاحية entangled states, information induced,
Entangled states and information induced by the atom–field interaction
Some aspects of the entangled states generated through an atom–field interaction through the Jaynes–Cummings model are discussed. The separability and inseparability of these states are studied for different parameters of the model concerning the field and the atom. We calculated the minimum amount of entanglement contained in the inseparable state and compared it with the total correlation through the mutual ... إقراء المزيد

2005 | الكلمات المفتاحية Entropic uncertainty, the Jaynes–Cummings model, Harmonic Generation,
Entropic uncertainty in the Jaynes–Cummings model in presence of a second harmonic generation
In the present communication we investigate the usual Jaynes–Cummings Hamiltonian model, describing two-level atom interacting with an electromagnetic field, in the presence of the second harmonic generation (degenerate parametric amplifier). Exact solutions of the wave function in the Schrödinger picture have been obtained for two different cases. In the first case the field frequency _ω_ is not equal to the ... إقراء المزيد

2005 | الكلمات المفتاحية Quantum teleportation, the Jaynes–Cummings model,
Quantum teleportation via entangled states generated by the Jaynes–Cummings model
In this contribution, quantum channels induced from an atom-field interaction (JCM), are used to teleport one and two qubit states. The initial state of the filed is taken to be in a coherent state while the atom starts from its excited state. The field parameters could be used as control parameters. It is shown that the fidelity of the teleported ... إقراء المزيد