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dipole–dipole interactions enhance non-Markovianity and protect information against dissipation

Chinese Physics B 2019年第9期28卷 100-106页

作者： Xiao-Ye Xu Qin-Qin Wang Zhe Chen Yong-Jian Han Chuan-Feng Li Guang-Can Guo Key Laboratory of Quantum Information of Chinese Academy of Sciences (CAS) University of Science and Technology of ChinaHefei 230026China CAS Center for Excellence in Quantum Information and Quantum Physics University of Science and Technology of ChinaHefei 230026China

Preserving non-Markovianity and quantum entanglement from decoherence effect is of theoretical and practical significance in the quantum information processing *** this context, we study a system S that is initially correlated with an ancilla A, which interacts with the environment E via an amplitude damping *** also consider dipole-dipole interactions(DDIs) between the system and ancilla, which are responsible for strong *** investigate the impact of DDIs and detuning on the non-Markovianity and information exchange in different *** show that DDIs are not only better than detuning at protecting the information(without destroying the memory effect) but also induce memory by causing a transition from Markovian to non-Markovian *** contrast, although detuning also protects the information, it causes a transition from non-Markovian to the Markovian *** addition, we demonstrate that the non-Markovianity grows with increasing DDI strength and diminishes with increasing *** also show that the effects of negative detuning and DDIs can cancel out each other, causing a certain loss of coherence and information.

关键词： decoherence non-Markovianity dipole-dipole interactions entanglement

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Effect of dipole-dipole interaction among atoms on atomic dynamics and entropy evolution of the field

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Chinese Science Bulletin 1996年第14期41卷 1165-1170页

作者：衣学喜孙昌璞 Institute of Theoretical Physics Northeast Normal University Changchun 130024 China

New developments in the high techniques associated with quantum optics have made it possible to produce a high-Q cavity with an extremely small size comparable to the wavelength of atomic emission. In such cavities with so small size, many distinctive phenomena of atomic motion interacting with cavity field appear to be quite attractive. The Jaynes-Cummings model describes the interaction of a two-level atom with a single mode field. When two atoms enter the domain of the cavity field simultaneously, and interact with each other through the dipole-dipole coupling with the exchange of

关键词： dipole-dipole interaction field entropy.

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Dynamic dipole-dipole Magnetic Interaction and Damped Nonlinear Oscillations

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Journal of Electromagnetic Analysis and Applications 2009年第4期1卷 195-204页

作者： Haiduke SARAFIAN 不详

Static dipole-dipole magnetic interaction is a classic topic discussed in electricity and magnetism text books. Its dynamic version, however, has not been reported in scientific literature. In this article, the author presents a comprehensive analysis of the latter. We consider two identical permanent cylindrical magnets. In a practical setting, we place one of the magnets at the bottom of a vertical glass tube and then drop the second magnet in the tube. For a pair of suitable permanent magnets characterized with their mass and magnetic moment we seek oscillations of the mobile magnet resulting from the unbalanced forces of the anti-parallel magnetic dipole orientation of the pair. To quantify the observed oscillations we form an equation describing the motion of the bouncing magnet. The strength of the magnet-magnet interaction is in proportion to the inverse fourth order separation distance of the magnets. Consequently, the corresponding equation of motion is a highly nonlinear differential equation. We deploy Mathematica and solve the equation numerically resulting in a family of kinematic information. We show our theoretical model with great success matches the measured data.

关键词： dipole-dipole Magnetic Interaction Damped Nonlinear Oscillations Mathematica

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Numerical Experiment for dipole-dipole Interaction in Electro-Magnetism with Help of a Regular Tetrahedron

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Open Journal of Physical Chemistry 2019年第1期9卷 13-32页

作者： Panagis G. Papadopoulos Panos D. Kiousis Christos G. Karayannis Laboratory of Structural Engineering Department of Civil Engineering Aristotle University of Thessaloniki Thessaloniki Greece Laboratory of Structural and Geotechnical Engineering Department of Civil and Environmental Engineering Colorado School of Mines Golden Colorado USA Laboratory of Concrete Structures Department of Civil Engineering Democritus University of Thrace Komotini Greece

Aim of this work is to try to explain, on a Rational basis, some equations of Electro-Magnetism, which are based on Experimental data. Any Electric Field can produce a Field of many small Electric dipoles, continuously distributed in space. In a region, where the Electric Field is constant, in direction and magnitude, all the small dipoles are parallel to the Electric Field, and are represented by a single, long, parallel to them, fixed in space, Electric dipole, which is here called Compass. An Alternating current, in a straight Conductor, is studied, by a simple, short computer program, for step-by-step nonlinear dynamic analysis. It is found that, only an Alternating current, not a direct current, can produce an Electric dipole, in a straight Conductor. The two above dipoles (Compass-Conductor) are assumed with equal lengths ℓ, lying on two skew lines, perpendicular to each other, at a distance ℓ√2, thus forming, by their four ends, a Regular Tetrahedron, with side length ℓ. Repulsion, between Like Charges, obeys the simple Coulomb Electro-Static law. Whereas Interaction (Attraction or Repulsion), between Unlike Charges, obeys a more accurate Lennard-Jones law. The analysis of dipole-dipole (Compass-Conductor) Interaction is performed by hand calculator. The only out-of-balance forces, in the regular Tetrahedron, acting on the Rigid Conductor, are the so-called magnetic forces. Their direction is found, in a simple Rational way, with help of Regular Tetrahedron, without recoursing to a “right-hand-rule”. The proposed model is applied to 1) The force acting on an Electric Charge moving in a magnetic field. 2) The force acting on a Current carrying straight Conductor, due to a magnetic field. 3) The magnetic fields created around a Current carrying straight Conductor. In these applications, proposed model gives reasonable results. Particularly, in third application, results, obtained by proposed model, are found in satisfactory approximation with

关键词： Electric Field Electric dipole Compass Conductor Alternating Current Step-by-Step Nonlinear Dynamic Algorithm dipole-dipole Interaction Regular Tetrahedron Coulomb Electro-Static Law Lennard-Jones Law Magnetic Field Vector Magnetic Forces Oersted-Ampère Rule

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Effect of Geodynamic Activities on an Existing Dam: A Case Study of Ojirami Dam, Southern Nigeria

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Journal of Geoscience and Environment Protection 2019年第9期7卷 200-213页

作者： K. O. Ozegin M. A. Bawallah S. O. Ilugbo A. A. Oyedele J. F. Oladeji Department of Physics Ambrose Alli University Ekpoma Nigeria Department of Applied Geophysics Federal University of Technology Akure Nigeria Department of Physics Ekiti State University Ado-Ekiti Nigeria Department of Applied Geology Federal University of Technology Akure Nigeria

Geodynamics is the study of the forces and their effects on motion and physics of the processes and the phenomena attending the steady evolution of the earth and the changes that are still going on. This study revealled the significance of electrical resistivity method on effect of geodynamic activities on an existing Dam monitoring at Ojirami Dam, Edo State, Nigeria. The electrical resistivity method involved three techniques: 2D Electrical Resistivity Tomography (ERT), Vertical Electrical Sounding (VES) and Horizontal Profiling (HP). 2D ERT using dipole-dipole electrode array with inter-station separation of 5 m and an expansion factor that varied from 1 to 5 with Nine (9) VES were carried out using Schlumberger array with current electrode spacing varying from 1.0 to 65.0 m and HP using Wenner array with an electrode spacing of 20 m and electrode movement at 5 meters. The 2-D imaging (dipole-dipole) gave information on the subsurface characteristic which section delineated five major geologic layers comprising of the topsoil, weathered basement, fractured zone, partly fractured basement and the fresh basement. The geoelectric sections identified three to four geoelectric/geologic subsurface layers along the traverse. The HP revealled the pattern of resistivity variations within the subsurface. The entire results correlate well with one another showing that all the techniques used were complemented. The combination of these techniques has proved effective and useful in geodynamic activities of the existing dam. Ojirami Dam is at a critical point of yielding to activities of geodynamic processes that may occur from the main axis, of major weak zones as observed between 75 to 95.00 m and 115 to 145.00 m. Hence, there is need to call government attention for further confirmatory test using other geophysical methods and subsequently putting in place remedial measures to prevent its future occurrence.

关键词： Periodic Monitoring Seepage dipole-dipole Pseudo-Section Geoelectric Section

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