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Thermal Entanglement in a Two-Qubit Ising Chain Subjected to Dzyaloshinsky–Moriya Interaction

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Chinese Physics Letters 2013年第12期30卷 5-8页

作者： B.G.Divyamani Sudha Department of Physics Kuvempu UniversityShankaraghattaShimoga-577451India Tunga Mahavidyalaya TirthahalliShimoga-577451India inspire institute inc. AlexandriaVirginia22303USA

Thermal entanglement of a two-qubit Ising chain subjected to an external magnetic field and Dzyaloshinsky–Moriya(DM)interaction is *** effect of magnetic field,strength of DM interaction and temperature are analyzed by adopting negativity of partial transpose as the measure of *** is shown that when the DM interaction along the Ising axis is considerable,thermal entanglement can be sustained for a higher *** usefulness of longitudinal DM interaction over the one that is perpendicular to the Ising axis,in the manipulation and control of entanglement at a feasible temperature,is illustrated.

关键词： temperature Ising interaction

Spin squeezing in Dicke-class of states with non-orthogonal spinors

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Chinese Physics B 2019年第6期28卷 66-71页

作者： K S Akhilesh K S Mallesh Sudha Praveen G Hegde Department of Physics University of MysoreManasagangotriMysuru-570006KarnatakaIndia Department of Physics Kuvempu UniversityShankaraghattaShimoga-577451India inspire institute inc. AlexandriaVirginia 22303USA

The celebrated Majorana representation is exploited to investigate spin squeezing in different classes of pure symmetric states of N qubits with two distinc. spinors, namely the Dicke-class of states. On obtaining a general expression for spin squeezing parameter, the variation of squeezing for different configurations is studied in detail. It is shown that the states in the Dicke-class, characterized by two-distinc. non-orthogonal spinors, exhibit squeezing.

关键词： Majorana representation of pure symmetric multiqubit states spin squeezing Dicke states

Comparative analysis of entanglement measures based on monogamy inequality

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Chinese Physics B 2017年第5期26卷 52-59页

作者： P J Geetha Sudha K S Mallesh Department of Physics Kuvempu University Shankaraghatta Shimoga-577 451 India inspire institute inc. Alexandria Virginia 22303 USA Department of Studies in Physics University of Mysore Mysore-570 006 India

We evaluate the monogamy inequality for symmetric, non-symmetric pure states of importance in terms of squared concurrence, squared entanglement of formation, squared negativity of partial transpose and compare the corresponding tangles. We show that though concurrence and concurrence tangle are zero for two special classes of mixed entangled states, both negativity tangle and entanglement of formation（EOF） tangle turn out to be non-zero. A comparison of different tangles is carried out in each case and it is shown that while the concurrence tangle captures the genuine multiqubit entanglement in N-qubit pure states with N distinc. spinors（containing GHZ and superposition of W-, obverse W states）either negativity tangle or EOF tangle is to be used as a better measure of entanglement in the W-class of states with two distinc. spinors and in the special classes of mixed multiqubit states.

关键词： entanglement tangle negativity superposition inequality entangled symmetric vanishing squared arbitrary

Nuclear Fusion Within Extremely Dense Plasma Enhanced by Quantum Particle Waves

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Plasma Science and Technology 2015年第5期17卷 366-371页

作者：苗峰曾宪俊邓柏权 Southwest University for Nationalities HOPE Innovations inc. Southwestern institute of Physics

Quantum effects play an enhancement role in p-p chain reactions occurring within stars. Such an enhancement is quantified by a wave penetration factor that is proportional to the density of the participating fuel particles. This leads to an innovative theory for dense plasma, and its result shows good agreement with independent data derived from the solar energy output. An analysis of the first Z-pinc. machine in mankind＇s history exhibiting neutron emission leads to a derived deuterium plasma beam density greater than that of water, with plasma velocities exceeding 10000 km/s. Fusion power could be achieved by the intersection of four such pinc.ed plasma beams with powerful head-on collisions in their common focal region due to the beam and target enhanced reaction.

关键词： quantum effects fusion enhancement extremely dense plasma

Fusion of Multi-Pinc.ed Plasma Beams Converging with Spatial Symmetry

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Plasma Science and Technology 2015年第7期17卷 552-559页

作者：苗峰曾宪俊邓柏权 Southwest University for Nationalities HOPE Innovations inc. Southwestern institute of Physics

Fusion reactions can be achieved by using deuterium from sea water as the *** amount of deuterium in one gallon of sea water contains energy equivalent to three hundred gallons of *** conditions of plasma temperature and density necessary to initiate fusion have been achieved in various research ***,the confinement time is not sufficient for ignition due to plasma *** we show that fatal plasma instabilities could be suppressed by the ingenious arrangement of multi-pinc.ed plasma beams converging symmetrically in space based on the minimization princ.ple of plasma potential *** tests are proposed using tiny wires containing *** successful,the results could lead to a feasible approach to obtaining commercial fusion power from sea water,hence without the need to use expensive and radioactive tritium as the fuel.

关键词： pinc. plasma multi-beam convergence spatial symmetry minimum energyprinc.ple

Fusion Reaction Rate Coefficient for Different Beam and Target Scenarios

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Chinese Physics Letters 2015年第2期32卷 43-47页

作者：欧巍曾宪俊邓柏权苟富均 institute of Nuclear Science and Technology Sichuan University HOPE Innovations inc. Southwestern institute of Physics

Fusion power output is proportional not only to the fuel particle number densities participating in reaction but also to the fusion reaction rate coefficient （or reactivity）, which is dependent on reactant velocity distribution functions. They are usuMly assumed to be dual Maxwellian distribution functions with the same temperature for thermal nuclear fusion circumstances. However, if high power neutral beam injection and minority ion species ICRF plasma heating, or multi-pinc.ed plasma beam head-on collision, in a converging region are required and investigated in future large scale fusion reactors, then the fractions of the injected energetic fast ion tail resulting from ionization or charge exchange will be large enough and their contribution to the non-Maxwellian distribution functions is not negligible, hence to the fusion reaction rate coefficient or calculation of fusion power. In such cases, beam-target, and beam-beam reaction enhancement effect contributions should play very important roles. In this paper, several useful formulae to calculate the fusion reaction rate coefticient for different beam and target combination scenarios are derived in detail

关键词： Fusion Reaction Rate Coefficient for Different Beam and Target Scenarios exp

Conditional Independence Leads to Satisfaction of the Bell Inequality without Assuming Non-Locality or Non-Reality

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Advances in Pure Mathematics 2022年第5期12卷 405-417页

作者： Louis Sica institute for Quantum Studies Chapman University Orange USA inspire institute inc. Alexandria USA

The original Bell inequality was obtained in a statistical derivation assuming three mutually cross-correlated random variables (four in the later version). Given that observations destroy the particles, the physical realization of three variables from an experiment producing two particles per trial requires two separate trial runs. One assumed variable value (for particle 1) occurs at a fixed instrument setting in both trial runs while a second variable (for particle 2) occurs at alternative instrument settings in the two trial runs. Given that measurements on the two particles occurring in each trial are themselves correlated, measurements from independent realizations at mutually exclusive settings on particle 2 are conditionally independent, i.e., conditionally dependent on particle 1, through probability. This situation is realized from variables defined by Bell using entangled particle pairs. Two correlations have the form that Bell computed from entanglement, but a third correlation from conditionally independent measurements has a different form. When the correlations are computed using quantum probabilities, the Bell inequality is satisfied without recourse to assumptions of non-locality, or non-reality.

关键词： Bell Theorem Bell Inequality Entanglement Cross-Correlations Conditional Independence

Loss of Exchange Symmetry in Multiqubit States under Ising Chain Evolution

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Chinese Physics Letters 2011年第2期28卷 39-42页

作者： Sudha B.G.Divyamani A.R.Usha Devi Department of Physics Kuvempu UniversityShankaraghattaShimoga-577451India DAMTP Centre for Mathematical SciencesWilberforce RoadCambridgeCB3OWAUK Department of Physics Bangalore UniversityBangalore-560056India inspire institute inc. McLeanVA 22101USA.

Keeping in view of importance of exchange symmetry aspects in studies on spin squeezing of multiqubit states,we show that the one-dimensional Ising Hamiltonian with nearest neighbor interactions does not retain the exchange symmetry of initially symmetric multiqubit *** we show that among 4-qubit states obeying exchange symmetry,all states except W class(and their linear combination)lose their symmetry under time evolution with Ising *** the loss of symmetry of the initially symmetric states to rotational asymmetry of the one-dimensional Ising Hamiltonian with more than 3 qubits,we indicate that all N-qubit states(N>5)obeying permutation symmetry lose their symmetry after time evolution with Ising Hamiltonian.

关键词： symmetry Ising qubit

Possibility of Classical Entanglement at LIGO

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International Journal of Astronomy and Astrophysics 2018年第3期8卷 267-274页

作者： Partha Ghose A. K. Rajagopal National Academy of Sciences India Allahabad India inspire institute inc. Alexandria USA

It is now established that entanglement in the sense of local non-factorizability of two or more degrees of freedom of a system occurs in classical polarization optics. We extend the idea to weak gravitational waves which are strikingly similar to optical waves. It is shown that a linearized classical gravity wave can in princ.ple get entangled in the sense mentioned with the vibrational modes of an array of test masses in a plane perpendicular to its direction of propagation. A Bell-CHSH inequality based on the requirement of noncontextuality for classical realism is derived, and it is shown that the putative nonfactorizable state violates this inequality. The idea is therefore empirically falsifiable.

关键词： Entanglement Classical Optics Gravitational Waves