We report an optical one-way quantum computing experiment with stationary quantum memory involved. First we create a hybrid four-qubit cluster state with two qubits propagating as photons and the other two stationary and stored in a laser-cooled atomic-ensemble quantum memory, and characterize it with entanglement witness and quantum state tomography. Then, by making use of this cluster state and fast operations of electro-optic modulators, we realize memory-assisted feedforward operations and demonstrate deterministic single-qubit rotation as an example.
@article{arxiv.1212.1817,
title = {Demonstration of active feedforward one-way quantum computing with photon-matter hyperentanglement},
author = {Xiao-Fan Xu and Xiao-Hui Bao and Jian-Wei Pan},
journal= {arXiv preprint arXiv:1212.1817},
year = {2012}
}