scholarly journals Quantum Optics with Giant Atoms—the First Five Years

2020 ◽  
pp. 125-146 ◽  
Author(s):  
Anton Frisk Kockum
Keyword(s):  
Electromagnetic Field ◽  
Quantum Optics ◽  
Experimental Results ◽  
Interference Effects ◽  
Multiple Points ◽  
Artificial Atoms ◽  
Superconducting Circuits ◽  
Recent Advances

Abstract In quantum optics, it is common to assume that atoms can be approximated as point-like compared to the wavelength of the light they interact with. However, recent advances in experiments with artificial atoms built from superconducting circuits have shown that this assumption can be violated. Instead, these artificial atoms can couple to an electromagnetic field at multiple points, which are spaced wavelength distances apart. In this chapter, we present a survey of such systems, which we call giant atoms. The main novelty of giant atoms is that the multiple coupling points give rise to interference effects that are not present in quantum optics with ordinary, small atoms. We discuss both theoretical and experimental results for single and multiple giant atoms, and show how the interference effects can be used for interesting applications. We also give an outlook for this emerging field of quantum optics.

scholarly journals Evaluation of recent advances in recommender systems on Arabic content

2021 ◽  
Vol 8 (1) ◽  
Author(s):  
Mehdi Srifi ◽  
Ahmed Oussous ◽  
Ayoub Ait Lahcen ◽  
Salma Mouline
Keyword(s):  
Recommender Systems ◽  
High Performance ◽  
Large Scale ◽  
State Of The Art ◽  
Experimental Results ◽  
Recent Advances ◽  
Research Gap ◽  
Text Preprocessing

AbstractVarious recommender systems (RSs) have been developed over recent years, and many of them have concentrated on English content. Thus, the majority of RSs from the literature were compared on English content. However, the research investigations about RSs when using contents in other languages such as Arabic are minimal. The researchers still neglect the field of Arabic RSs. Therefore, we aim through this study to fill this research gap by leveraging the benefit of recent advances in the English RSs field. Our main goal is to investigate recent RSs in an Arabic context. For that, we firstly selected five state-of-the-art RSs devoted originally to English content, and then we empirically evaluated their performance on Arabic content. As a result of this work, we first build four publicly available large-scale Arabic datasets for recommendation purposes. Second, various text preprocessing techniques have been provided for preparing the constructed datasets. Third, our investigation derived well-argued conclusions about the usage of modern RSs in the Arabic context. The experimental results proved that these systems ensure high performance when applied to Arabic content.

A REFORMULATED BOUNDARY PERTURBATION THEORY IN ELECTROMAGNETISM AND ITS APPLICATION TO A SPHERE

1967 ◽  
Vol 45 (5) ◽  
pp. 1729-1743 ◽  
Author(s):  
M. L. Burrows
Keyword(s):  
Electromagnetic Field ◽  
Perturbation Theory ◽  
Classical Method ◽  
Experimental Results ◽  
Boundary Perturbation ◽  
Conducting Sphere ◽  
Classical Formulation ◽  
Classical Class ◽  
New Formulation ◽  
Boundary Perturbations

The classical method of solving electromagnetic field problems involving boundary perturbations is reformulated in a way that is both more general and simpler. The new formulation makes it easier to apply the theory to the class of boundaries amenable to the classical formulation, and shows that it can also be applied to other boundary shapes. As an example, the perfectly conducting sphere with surface perturbations has been treated, using the methods appropriate only for boundaries in the classical class and also using those applicable to the larger class. Some experimental results which appear to support the theory are reported.

Artificial atoms for quantum optics

2006 ◽  
Vol 5 (11) ◽  
pp. 855-856 ◽  
Author(s):  
Rudolf Bratschitsch ◽  
Alfred Leitenstorfer
Keyword(s):  
Quantum Optics ◽  
Artificial Atoms

scholarly journals Analysis and Experiment for Wireless Power Transfer Systems with Two Kinds Shielding Coils in EVs

Energies ◽  
2020 ◽  
Vol 13 (1) ◽  
pp. 277
Author(s):  
Yushan Wang ◽  
Baowei Song ◽  
Zhaoyong Mao
Keyword(s):  
Electromagnetic Field ◽  
Wireless Power Transfer ◽  
Experimental Results ◽  
Field Analysis ◽  
Transfer Efficiency ◽  
Power Transfer ◽  
Wireless Power ◽  
Element Analysis ◽  
Surrounding Space ◽  
Electric Field Analysis

Electric vehicles (EVs) with wireless power transfer (WPT) systems are convenient, but WPT technology will produce a strong stray electromagnetic field (EMF) in the surrounding space when the system works with high power. Shielding coils can reduce stray EMF efficiently without additional control, and they have advantages of being simple, light, and cheap. In this paper, the series-opposing structure is compared systematically with the inductive structure based on circuit theory and electromagnetic field theory. Simplified circuit models are proposed to give an intuitive and comprehensive analysis of transfer efficiency. Electric field analysis and finite element analysis (FEA) is used to explain the functional principles of shielding coils and to compare the EMF distribution excited by two structures. The simulation results show that both structures decrease the mutual inductance and perform better than the system without shielding coils when they have the same transfer efficiency. Further, the inductive structure system performs best. The most important between two structures is that the shielding effects is independent of turns of shielding coils for inductive structure, while it can be adjusted by changing turns of shielding coils for the series-opposing structure. The experimental results show that the EMF is reduced by 65% for the inductive structure and 40% for the series-opposing structure. The theoretical analysis is confirmed by experimental results.

scholarly journals Surface Plasmon Singularities

2012 ◽  
Vol 2012 ◽  
pp. 1-7 ◽  
Author(s):  
Gabriel Martínez-Niconoff ◽  
P. Martinez-Vara ◽  
G. Diaz-Gonzalez ◽  
J. Silva-Barranco ◽  
A. Carbajal-Domínguez
Keyword(s):  
Shock Wave ◽  
Boundary Condition ◽  
Electromagnetic Field ◽  
Metal Surface ◽  
Surface Plasmon ◽  
Computer Simulations ◽  
Free Space ◽  
Experimental Results ◽  
Physical Features

With the purpose to compare the physical features of the electromagnetic field, we describe the synthesis of optical singularities propagating in the free space and on a metal surface. In both cases the electromagnetic field has a slit-shaped curve as a boundary condition, and the singularities correspond to a shock wave that is a consequence of the curvature of the slit curve. As prototypes, we generate singularities that correspond to fold and cusped regions. We show that singularities in free space may generate bifurcation effects while plasmon fields do not generate these kinds of effects. Experimental results for free-space propagation are presented and for surface plasmon fields, computer simulations are shown.

Test Method for Crosstalk Faults in VLSI Circuits Based on Multiple-Valued Decision Diagrams

2010 ◽  
Vol 20-23 ◽  
pp. 641-646
Author(s):  
Zhong Liang Pan ◽  
Ling Chen
Keyword(s):  
Digital Circuits ◽  
Digital Circuit ◽  
Vlsi Circuits ◽  
Test Method ◽  
Experimental Results ◽  
Decision Diagrams ◽  
Interference Effects ◽  
Test Set ◽  
Difference Operation ◽  
Test Vectors

The crosstalk fault in VLSI circuits is one of the interference effects being caused by parasitic capacitance and inductance coupling, it can lead to functional errors of circuits. It is necessary to detect the crosstalk faults in order to insure the functions of circuits. A new test method for crosstalk faults in VLSI circuits based on multiple-valued decision diagrams is presented in this paper, the test vectors of crosstalk faults are generated by building a multiple-valued decision diagram that is a difference operation of the two multiple-valued decision diagrams corresponding to the normal circuit and faulty circuit, respectively. One advantage of the test method is that it can get all test vectors of a given crosstalk fault, therefore for a digital circuit, the test set with minimal number of test vectors can be obtained. Experimental results on a lot of digital circuits demonstrate the feasibility of the method proposed in this paper.

scholarly journals Electromagnetic Field Simulation for ICRF Antenna and Comparison with Experimental Results in LHD

2010 ◽  
Vol 5 ◽  
pp. S2104-S2104 ◽  
Author(s):  
Takashi MUTOH ◽  
Hiroshi KASAHARA ◽  
Tetsuo SEKI ◽  
Kenji SAITO ◽  
Ryuhei KUMAZAWA ◽  
...  
Keyword(s):  
Electromagnetic Field ◽  
Experimental Results ◽  
Field Simulation

scholarly journals Joule Thief Sebagai Boost Converter Daya LED Menggunakan Sel Volta Berbasis Air Laut

2018 ◽  
Vol 4 (2) ◽  
pp. 52
Author(s):  
Anwar Mujadin ◽  
Suci Rahmatia
Keyword(s):  
Electromagnetic Field ◽  
Electric Current ◽  
Light Emitting Diode ◽  
Boost Converter ◽  
Experimental Results ◽  
Power Transfer ◽  
Light Emitting ◽  
Electric Circuits ◽  
Led Lights

<p><em>Abstrak – </em><strong>Joule-Thief adalah salah satu rangkaian listrik  untuk konservasi  energi dengan menggunakan teknis medan elektromagnetik arus transien pada sebuah coil. Sirkuit ini dioperasikan menggunakan  sebuah MOSFET sebagai saklar untuk meregenerasi  tegangan dan arus listrik dalam satuan waktu kemudian disalurkan pada beban light emitting diode (LED). Dari hasil eksperimental,  sel volta berbasis air laut dengan tegangan jepit 0.8V mampu mengaktifkan lampu LED dengan konfigurasi rangkaian serial. Hasilnya menunjukkan bahwa power transfer maksimum dari sirkuit Joule-thief sangat efektif sebagai pemasok daya beban 60 LED.</strong></p><p><strong> </strong></p><p><strong><em>Kata Kunci </em></strong><em>- <strong> </strong>Joule Thief, Boost Converter Daya LED, Sel Volta Berbasis Air Laut<strong></strong></em></p><p><em> </em></p><p><em>Abstract –</em> <strong>Joule-Thief is one of the electric circuits for conservation energy by using electromagnetic field trancient current in a coil. This circuit is operated using a MOSFET as a switch to regenerating the voltage and current flowing along the coil. The electric current accumulates in the coil then in unity of time will be supplied to the light emitting diode (LED) load. From experimental results, water sea voltaic cells based with 0.8V clamp voltage are able to activate LED lights in serial circuit configurations. The results shown that power transfer joule-thief circuit is very effective capable of supplying LED up to 60 LEDs.</strong></p><p><strong> </strong></p><p><strong><em>Keywords </em></strong><em>- Joule Thief, </em><em>Boost Converter Power LED</em><em>, </em><em>Sea-Based Voltaic Cells</em><em></em></p>

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