Abstract
In this paper, we consider the 1D two-qubit isotropic antiferromagnetic Heisenberg XXX model in an external magnetic field B. Firstly, we pay our attention to study the properties of thermal entanglement in XXX model, and in comparison with XX model, we found that the thermal entanglement could be easily obtained and quantum phase transition could not easily occur in XXX model. Finally, we calculate the fidelity of teleportation of one-qubit pure state via thermally entangled state of a two-qubit Heisenberg XXX chain, in the same way, we compare XXX model with XX model, we found that teleportation via thermally entangled state of a two-qubit Heisenberg XXX chain may be better.
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