In this work we propose a hybrid scheme to implement a photonic controlled-z (CZ) gate using photon storage in highly-excited Rydberg states, which controls the effective photon-photon interaction using resonant microwave fields. Our scheme decouples the light propagation from the interaction and exploits the spatial properties of the dipole blockade phenomenon to realize a CZ gate with minimal loss and mode distortion. Excluding the coupling efficiency, fidelities exceeding 95% are achievable and are found to be mainly limited by motional dephasing and the finite lifetime of the Rydberg levels.
@article{arxiv.1309.7933,
title = {All-optical quantum information processing using Rydberg gates},
author = {D. Paredes-Barato and C. S. Adams},
journal= {arXiv preprint arXiv:1309.7933},
year = {2014}
}