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.
@article{arxiv.1412.8649,
title = {Controlled remote state preparation via partially entangled quantum channel},
author = {Chun Wang and Zhi Zeng and Xi-Han Li},
journal= {arXiv preprint arXiv:1412.8649},
year = {2014}
}