701 research outputs found
Protecting entangled states of two ions by engineering reservoir
We present a proposal for realizing local decoherence-free evolution of given
entangled states of two two-level (TL) ions. For two TL ions coupled to a
single heavily damped cavity, we can use engineering reservoir scheme to obtain
a decoherence-free subspace which can be nonadiabatically controlled by the
system and reservoir parameters. Then the local decoherence-free evolution of
the entangled states are achieved. And we also discuss the relation between the
geometric phases and the entanglement of the two ions under the nonadiabatic
coherent evolution
Quantum and classical correlations in the one-dimensional XY model with Dzyaloshinskii-Moriya interaction
We study the effect of Dzyaloshinskii-Moriya (DM) interaction on pairwise
quantum discord, entanglement, and classical correlation in the anisotropic XY
spin-half chain. Analytical expressions for both quantum and classical
correlations are obtained from the spin-spin correlation functions. We show
that these pairwise quantities exhibit various behaviors in relation to the
relative strengths of the DM interaction, the anisotropy and the magnetic
intensity. We observe non-analyticities of the derivatives of both quantum and
classical correlations with respect to the magnetic intensity at the critical
point, with consideration of the DM interaction.Comment: 18pages, 6figure
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