Quantum State Transfer Via a Two-Qubit Heisenberg XYZ Spin Model

We report the transfer fidelities of two-qubit pure state via a two-qubit Heisenberg XYZ spin model under a nonuniform magnetic field. It shown us that not only the average fidelity can be enhanced evidently but also the ideal fidelity region can be broadened by introducing the interaction of z component of two neighboring spins J(z). Decreasing the anisotropy parameter gamma also can improve F(a) and result in ideal fidelity. Our study on the average fidelity of this quantum channel system also shows that for any finite value of temperature T we can obtain the ideal average fidelity by improving the inhomogeneous magnetic field b. F(a) is infinitely close to the maximum value of classical communication 2/3 with increasing b. While increasing the uniform field B can not do this, F(a) are always inferior to 2/3 for enough larger B.