Controlled remote state preparation via partially entangled quantum channel

Abstract

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.