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Electromagnetic tomography: dyadic green's function method

Progress in Natural science:Materials International 2001年第1期 69-77页

作者：熊汉亮徐苓安 China school of Automation Tianjin 300072 Tianjin University

This study aims at formulating a dyadic green" s function method for directly solving the forward and inverse problems of the electromagnetic tomography (EMT) with parallel field sensor. First, an integral equation of the electromagnetic problem for the EMT sensor is presented in terms of an equivalent source, which takes the dyadic green’s function G(r,r’) as its kernel. Next, starting from a single conducting cylinder filled with homogeneous medium, a convenient way of finding the electric dyadic green’ s function of the first kind Get( r, r) is described based on the method of Gm. Then, an eigenfunction expansion of the Gel( r, r) into vector wave functions M and N is obtained by means of a contour integration. Finally, an expression of the G( r, r’), the dyadic green’s function for the EMT sensor with cylindrically layered structure, is deduced from Gel(r,r) by adding reflected wave terms to it.

关键词： electromagnetic theory inverse problem dyadic green’s function tomography image reconstruction.

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Qubit-qubit quantum coherence mediated by an epsilon-near-zero waveguide

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Communications in Theoretical Physics 2024年第12期76卷 52-61页

作者： Zhenhua Yin Jicheng Wang Yueke Wang Yun Zhu Mengmeng Li sergei Khakhomov Zheng-Da Hu school of science Jiangnan University Key Laboratory of Optoelectronic Devices and systems of Ministry of Education and Guangdong Province Department of Communication Engineering Nanjing University of Science and Technology Departments of Optics and General Physics Francisk Skorina Gomel State University

Quantum coherence, as a more general quantum resource compared to quantum entanglement,has attracted increasing attention over recent years. Establishing stable quantum coherence is crucial for implementing reliable quantum information tasks. In this study, we propose a scheme to generate stable quantum coherence of two qubits via an epsilon-near-zero（ENZ） *** find that employing si3N4rather than siO2results in stronger qubit-qubit coupling and maximal quantum coherence in a certain range. We derive analytical expressions for both quantum coherence and quantum entanglement, allowing for direct comparison within a unified framework. To achieve stable quantum coherence, classical field driving is introduced. We find that stable coherence is much larger and easier mediated than that of stable entanglement. Our work contributes to the creation of a new stable quantum resource via an ENZ waveguide.

关键词： dyadic green’s function epsilon-near-zero waveguide metamaterial quantum coherence quantum entanglement

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REsEARCH ON INPUT IMPEDANCE OF DIPOLE ANTENNA IN GTEM CELL

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Journal of Electronics(China) 2014年第6期31卷 603-608页

作者： Xing shuguang Lv Xiaode Ding Chibiao Institute of Electronics Chinese Academy of Sciences National Key Laboratory of science and Technology on Microwave Imaging

The formula of input impedance of dipole antenna in Gigahertz Transverse ElectroM agnetic(GTEM) cell based on the dyadic green's function is first obtained in this paper. The validation of the formula is verified by the results of theoretical derivation and simulation with well agreements. In comparison with the formula of input impedance in free space, the relationship between the change of input impedance with the length of antenna and the position of antenna in GTEM cell is obtained. In addition, some meaningful conclusions are presented, which not only can be referred by the further research of ElectroM agnetic Interference(EMI) measurements in GTEM cell, but also provide the theoretical basis for testing compensation and error analysis.

关键词： Electro Magnetic Interference(EMI) measurement Gigahertz Transverse ElectroM agnetic(GTEM) cell Dipole antenna Input impedance dyadic green’s function

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