Controllable quantum state transfer via XY-type exchange interaction of flux qubits

摘要

We present a controllable scheme for transferring quantum state by means of an XY-type exchange interaction of flux qubits. In our scheme, the qubit encoding the state and the two neighboring qubits of channel is evolved under controllable Hamiltonian, and lastly, the single-qubit Pauli rotation operation is executed in the output qubit. Then, an arbitrary single-qubit state can be successfully transferred with high fidelity. At the same time, we compare the required total time for performing all transfer steps with systematical decoherent time and declare that our scheme is valid within current quantum experimental technology.