Cross-phase modulation at the single-photon level has a wide variety of fundamental applications in quantum optics including the generation of macroscopic entangled states. Here we describe a practical method for producing a weak cross-phase modulation at the single-photon level using metastable xenon in a high finesse cavity. We estimate the achievable phase shift and give a brief update on the experimental progress towards its realization. A single-photon cross-phase modulation of approximately 20 milliradians is predicted by both a straightforward perturbation theory calculation and a numerical matrix diagonalization method.
@article{arxiv.1403.6340,
title = {Feasibility of single-photon cross-phase modulation using metastable xenon in a high finesse cavity},
author = {B. T. Kirby and G. T. Hickman and T. B. Pittman and J. D. Franson},
journal= {arXiv preprint arXiv:1403.6340},
year = {2014}
}