mahmoud.abdelatty

محمود محمد أحمد عبدالعاطى

استاذ - أستاذ

كلية العلوم

العنوان: Sohag, 15 Str

17

إعجاب
2011 | الكلمات المفتاحية MAGNETIC FLUX SENSITIVITY, PANCHARATNAM PHASE, solid state qubit,
MAGNETIC FLUX SENSITIVITY OF THE POPULATION AND THE PANCHARATNAM PHASE FOR A SINGLE COOPER-PAIR BOX
We study the behaviour of a single Cooper-pair box with a SQUID loop interacting with a magnetic field. We demonstrate the strong dependence of the population and the Pancharatnam phase on the magnetic flux and study the modifications when a temporal drift is present on the magnetic field. Moreover, we show that the Pancharatnam phase is more sensitive to the ... إقراء المزيد

2011 | الكلمات المفتاحية Entanglement, Quantum information,
Advances in Entanglement and Quantum Information Theory
In this book, various types of entanglement have been discussed for systems start from a pure state or mixed states and many new features have been discovered. A general expression of the mixed state entanglement is obtained with the physical significance (with or without the diagonal approximation treatments). The particular advantages of using Shannon entropy are highlighted and the information ... إقراء المزيد

2011 | الكلمات المفتاحية The quantum computational,
The quantum computational speed of a single Cooper-pair box
The speed of computations is investigated by means of the orthogonality speed for a charged qubit interacting with a single cavity field prepared initially in a Fock state or Binomial state. We observe that the rate of the computational speed is related to the number of photons inside the cavity. Moreover, we show that the qubit–field coupling plays an opposite ... إقراء المزيد

2011 | الكلمات المفتاحية Multi-particle, qubits, nanoresonator,
Multi-particle entanglement of charge qubits coupled to a nanoresonator
a b s t r a c t The dynamics of charge qubits coupled to a nanomechanical resonator under the influence of both a phonon bath in contact with the resonator and irreversible decay of the qubits is considered. The focus of our analysis is devoted to multi-particle entanglement and the effects arising from the coupling to the reservoir. Even ... إقراء المزيد

2011 | الكلمات المفتاحية PANCHARATNAM PHASE, Cooper-pair boxes, a dissipative cavity,
Pancharatnam phase of two Cooper-pair boxes in a dissipative cavity
The time evolution of a single Cooper pair in the presence of another Cooper pair interacting with an electromagnetic field in a dissipative cavity is presented. The strong dependence of the dynamics of two superconducting charge qubits interacting with the microcavity field on the instantaneous phase shift experienced by the second qubit is demonstrated. The Pancharatnam phase is found to ... إقراء المزيد

2011 | الكلمات المفتاحية Entanglement, Dynamics, a Cavity,
Entanglement Dynamics for Two Atoms Inside a Cavity
An analytical treatment is provided of some different classes of two atoms having two or three energy levels whose dynamics show the presence of different entanglement. The phenomenon of sudden death of entanglement is investigated subject to different initial states settings. We find that for an initial Fock state, the presence of one or more photons in the cavity is ... إقراء المزيد

2011 | الكلمات المفتاحية a Cavity Field, THREE-LEVEL ATOM, Wehrl entropy,
WEHRL ENTROPY OF A MIXED STATE THREE-LEVEL ATOM INTERACTING WITH A CAVITY FIELD
In this paper, the Wehrl entropy approach is discussed and compared with the quantum entanglement using a mixed-state three-level atom interacting with a cavity field. In the pure state case, the behavior of the atomic Wehrl entropy shows the same behavior of the entanglement due to the von-Neumann entropy, while the mixed state case gives the total correlation due to ... إقراء المزيد

2011 | الكلمات المفتاحية Wehrl entropy, Wehrl PD, Kerr medium,
Dynamics of Wehrl entropy of a degenerate two-photon process with a nonlinear medium
This paper describes the dynamics of the Wehrl entropy and Wehrl phase distribution of a degenerate two-photon of a single mode interacting with a two-level system with a nonlinear medium. A general analytic expression for the Husimi _Q_ function is obtained. The influence of various parameters on the Wehrl entropy and Wehrl phase distribution are explored. It is shown that ... إقراء المزيد

2010 | الكلمات المفتاحية dissipative cavities, entanglement sudden death, lived entanglement,
Two atoms in dissipative cavities in dispersive limit: entanglement sudden death and long-lived entanglement
We investigate the entanglement dynamics and coherence of two two-level atoms interacting with two coherent fields of two spatially separated and dissipative cavities. It is in particular shown that entanglement sudden death is obtained within a short interaction time. However, after a long interaction time a long-lived entanglement is shown; that is, the initial entanglement of two atoms could be ... إقراء المزيد