  We consider a hybrid quantum system consisting of a qubit system continuously
evolving according to its fixed own Hamiltonian and a quantum computer. The
qubit system couples to a quantum computer through a fixed interaction
Hamiltonian, which can only be switched on and off. We present quantum
algorithms to approximately transfer quantum information between the qubit
system with limited control and the quantum computer under this setting. Our
algorithms are programmed by the gate sequences in a closed formula for a given
interface interaction Hamiltonian.
