The influence of phase damping on a two-level atom in the presence of the classical laser field

Abdalla, M. Sebawe; Obada, A.‐S. F.; Khalil, E. M.; Ali, S. I.

doi:10.1088/1054-660x/23/11/115201

Cited by 23 publications

(10 citation statements)

References 42 publications

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“…The key argument is based on the Schur-Horn's theorem (that indicates essentially that p i ≤ λ i ) and on the fact that, in order to to keep some basic properties of the entropies such as increasing with disordered, the functions f are concave (so based on power or logarithmic functions). Then Jensen's inequality for concave function proves the result [23][24][25][26][84][85][86].…”

Section: Informational Versus Spectral Psdmentioning

confidence: 96%

Phase-space-density limitation in laser cooling without spontaneous emission

2018

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We study the possibility to enhance the phase space density of non-interacting particles submitted to a classical laser field without spontaneous emission. We clearly state that, when no spontaneous emission is present, a quantum description of the particle motion is more reliable than semi-classical description which can lead to large errors especially if no care is taken to smooth structures smaller than the Heisenberg uncertainty principle. Whatever the definition of position-momentum phase space density, its gain is severely bounded especially when started from a thermal sample. More precisely, the maximum of the position-momentum phase space density, can only increase by a factor M for M -level particles. This bound comes from a transfer between the external and internal degrees of freedom. Therefore, it is impossible to increase the position-momentum phase space density in the same internal state.

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Section: Informational Versus Spectral Psdmentioning

confidence: 96%

Phase-space-density limitation in laser cooling without spontaneous emission

2018

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“…Its considered as a phenomenon that describe the collapses and revivals of the states. We can evaluate the population inversion for the proposed model by the variation between the probabilities of the system existence in its exited state |e and in its ground state |g [27,38,39].…”

Section: The Population Inversionmentioning

confidence: 99%

Entanglement of a Nanowires System with Rashba Interaction

et al. 2021

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We propose a scheme to investigate the behavior of a ballistic nanowire system with Rashba interaction within a perpendicular magnetic field. The quantum entanglement of a nanowire system is discussed via the negativity. When the strong and weak magnetic fields are applied, we discuss the influence of the spin-orbit interaction and the initial states on the population inversion and the negativity. Our results show that the degree of entanglement for the nanowire system mainly depends on the effect of the spin-orbit interaction and the initial states of the system. This opens up new avenues for designing nanowire systems for future quantum computation and communication applications.

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“…(1) as it stands is very hard to tackle. Thus, in what follow, we remove the classical field whereupon remove the converter part through two well-known canonical transformations [79,86,[92][93][94][95][96].…”

Section: Canonical Transformationmentioning

confidence: 99%

Entanglement of a System of an Indirectly Linked Two-Coupled-Cavity through an Optical Fiber Cable for Single Excitation Atomic States in the Presence of an External Field

Hanoura

2021

Preprint

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The dynamics of the quantum entropies of a system of two cavities coupled by an optical fiber cable, each cavity contains a two-level atom interacting with a single electromagnetic field in addition to an external classical field, is investigated. Under canonical transformations, the considered Hamiltonian is diagonalized. Effective Hamiltonians in three different limiting regimes: namely large optical fiber cable coupling bstrength, large detunig, and comparable detuning and optical fiber cable coupling strength, are derived. The ith ¯ -tom are respectively prepared in the superposition coherent and the ground states while the fields are prepared in the vacuum states. An analytical expression for the solution of the Schr¨odinger equation for each dispersive is derived. The degree of entanglement (DEM) is studied by using von Neumann atomic entropies. The influences of both the optical fiber cable coupling strength and the detuning on the evolution of the DEM ”their values are closely chosen to be compatible with the imposed restrictions for the applications of the different regimes” are analyzed. General conclusions reached are illustrated by numerical results.

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The influence of phase damping on a two-level atom in the presence of the classical laser field

Cited by 23 publications

References 42 publications

Phase-space-density limitation in laser cooling without spontaneous emission

Phase-space-density limitation in laser cooling without spontaneous emission

Entanglement of a Nanowires System with Rashba Interaction

Entanglement of a System of an Indirectly Linked Two-Coupled-Cavity through an Optical Fiber Cable for Single Excitation Atomic States in the Presence of an External Field

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