Large Cross-Phase Modulations at the Few-Photon Level
Abstract
We demonstrate an efficient cross-phase modulation (XPM) based on a closed-loop double-{\Lambda} system. The property of the double-{\Lambda} medium can be controlled by changing the phases of the applied optical fields. This phase-dependent XPM scheme can achieve large phase modulations at low-light intensities without requiring cavities or tightly focusing of laser beams. With this scheme, we observe a {\pi}-level phase shift with two pulses both consisting of 8 photons in cold rubidium atoms. Such novel scheme provides a simple route to generate strong interactions between photons and may have potential applications in all-optical quantum signal processing.
Cite
@article{arxiv.1607.00818,
title = {Large Cross-Phase Modulations at the Few-Photon Level},
author = {Zi-Yu Liu and Yi-Hsin Chen and Yen-Chun Chen and Hsiang-Yu Lo and Pin-Ju Tsai and Ite A. Yu and Ying-Cheng Chen and Yong-Fan Chen},
journal= {arXiv preprint arXiv:1607.00818},
year = {2016}
}
Comments
5 pages, 4 figures, supplemental matrial: 7 pages, 6 figures. arXiv admin note: substantial text overlap with arXiv:1409.4153, arXiv:1302.1744