  Quantum computation attaches importance to high-precision quantum
manipulation, where the quantum state transfer with high fidelity is necessary.
Here, we propose a new scheme to implement the quantum state transfer of high
fidelity and long distance, by adding on-site potential into the qubit chain
and enlarging the proportion of the coupling strength between the two ends and
the chain. In the numerical simulation, without decoherence, the transfer
fidelities of 9 and 11 qubit chain are 0.999 and 0.997, respectively. Moreover,
we give a detailed physical realization scheme of the quantum state transfer in
superconducting circuits, and discuss the tolerance of our proposal against
decoherence. Therefore, our scheme will shed light on quantum computation with
long chain and high-fidelity quantum state transfer.
