Entropy Associated with Information Storage and Its Retrieval

Alhasan, Abu Mohamed

doi:10.3390/e17085920

Cited by 7 publications

(11 citation statements)

References 52 publications

(53 reference statements)

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“…Our treatment for the time evolution of the dressed atom is based upon the density matrix approach. We are working with the density matrix in the flatten form as e α , where α numerates the maximum accessible bases from 1 to 28 [19]. Such general formalism will enable us to reveal enhancements of all accessible multipoles of the density matrix.…”

Section: Introductionmentioning

confidence: 99%

Entropy Associated with Local Stabilization of the Pulse Area in Multilevel Atomic Media

Alhasan

2018

Acta Phys. Pol. A

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This paper provides an entropy analysis to resonant and short pulses propagation in four-level atomic medium. As an example, we take D1 transition in rubidium 87 Rb atoms including hyperfine structure. We show how to construct the time dependent Bloch-metric for each optical transition in the Liouville space. Furthermore, we attempt to relate local stabilization of the pulse area to the distribution of the space-entropy.

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Section: Introductionmentioning

confidence: 99%

Entropy Associated with Local Stabilization of the Pulse Area in Multilevel Atomic Media

Alhasan

2018

Acta Phys. Pol. A

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“…A detailed description of the Bloch-equations can be found in [5]. The right hand side of Equation 2 represents the density matrix component corresponding to the coherence for each transition.…”

Section: Energy Level Diagram and Maxwell-bloch Equationsmentioning

confidence: 99%

“…The time evolution of the dressed atom is based upon the density matrix approach [5]. For four-color excitation we use decompositions of probe and coupling fields for two-color excitation as…”

Section: Energy Level Diagram and Maxwell-bloch Equationsmentioning

confidence: 99%

Short pulses propagation in multilevel atomic media

Alhasan¹

2018

AIP Conference Proceedings

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Abstract. We investigate short pulses propagation through multilevel atomic vapors. The medium is composed of an ensemble of four atomic levels generated by the hyperfine structure of the D 1 transition in Rubidium-87 atoms. The pulses are resonant to their respective optical transitions, in order to have a well-defined pulse area definition. We discuss local stabilization of the pulse area with or without energy stabilization and as a function of the prolonged distance. Furthermore, we explore some new features for the propagation dynamics in multilevel atomic media which are beyond the traditional framework of McCall and Hahn area theorem and self-induced transparency.

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“…However, in this case, we attempt mainly to reveal the system's behavior showing the locations of non-linearity that are exposed by peaks downwards or upwards. In fact, these transition are due to interference effects among different ranks of the density matrix [8]. Figures 4 and 5 show the spikes with maximum-entropy and minimum-entropy.…”

Section: Graph-entropymentioning

confidence: 96%

“…The state of the dressed atom is described by Liouville-von Neumann type equation for the reduced density matrix [4,8]. Let (z, t) represent space-time coordinates in the laboratory frame.…”

Section: Theoretical Descriptionmentioning

confidence: 99%

Graph Entropy Associated with Multilevel Atomic Excitation

Alhasan

2019

The 5th International Electronic Conference on Entropy and Its Applications

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A graph-model is presented to describe multilevel atomic structure. As an example, we take the double Λ configuration in alkali-metal atoms with hyperfine structure and nuclear spin I = 3/2, as a graph with four vertices. Links are treated as coherence. We introduce the transition matrix which describes the connectivity matrix in static graph-model. In general, the transition matrix describes spatiotemporal behavior of the dynamic graph-model. Furthermore, it describes multiple connections and self-looping of vertices. The atomic excitation is made by short pulses, in order that the hyperfine structure is well resolved. Entropy associated with the proposed dynamic graph-model is used to identify transitions as well as local stabilization in the system without invoking the energy concept of the propagated pulses.

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Entropy Associated with Information Storage and Its Retrieval

Cited by 7 publications

References 52 publications

Entropy Associated with Local Stabilization of the Pulse Area in Multilevel Atomic Media

Entropy Associated with Local Stabilization of the Pulse Area in Multilevel Atomic Media

Short pulses propagation in multilevel atomic media

Graph Entropy Associated with Multilevel Atomic Excitation

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