Abstract
We studied the influence of the impurity to the entanglement in three-qubit Heisenberg XX chain and got the analytical expression of the concurrence C , go a step further, for fixed J, we discussed the concrete effect of the impurity parameter J 1 to the concurrence. At the condition T→0, when | J 1|⪢| J|, the concurrence C=(2 2 −1)/4 ; when J 1→− J and J→∞, the concurrence C get its maximum value 1/2.
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