Effects of anisotropy on optimal dense coding

Details Effects of anisotropy on optimal dense coding Effects of anisotropy on optimal dense coding

2008-11-13

arxiv.org/abs/0811.2017v1

Physics

Quantum Physics

Accepted by physica scripta

Scientific paper

10.1088/0031-8949/79/01/015001

We study optimal dense coding with thermal entangled states of a two-qubit anisotropic \emph{XXZ} model and a Heisenberg model with Dzyaloshinski-Moriya (DM) interactions. The DM interaction is another kind of anisotropic antisymmetric exchange interaction. The effects of these two kinds of anisotropies on dense coding are studied in detail for both the antiferromagnetic and ferromagnetic cases. For the two models, we give the conditions that the parameters of the models have to satisfy for a valid dense coding. We also found that even though there is entanglement, it is unavailable for our optimal dense coding, which is the same as entanglement teleportation.

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