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

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

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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

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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 9-12页

作者： b.g.divyamani Sudha Department of Physics Kuvempu UniversityShankaraghattaShimoga-577 451India Tunga Mahavidyalaya TirthahalliShimoga-577 451India Inspire Institute Inc. AlexandriaVirginia22303USA

Thermal entanglement of a two-qubit Ising chain subjected to an external magnetic field and DzyaloshinskyMoriya(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.

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