  We propose two controlled remote state preparation protocols via partially
entangled channels. One prepares a single-qubit state and the other prepares a
two-qubit state. Different from other controlled remote state preparation
schemes which also utilize partially entangled channels, neither auxiliary
qubits nor two-qubit unitary transformations are required in our schemes and
the success probabilities are independent of the coefficients of the quantum
channel. The success probabilities are 50% and 25% for arbitrary single-qubit
states and two-qubit states, respectively. We also show that the success
probabilities can reach 100% for restricted classes of states.
