Large Cross-Phase Modulations at the Few-Photon Level

• Published in: Physical review letters Vol. 117; no. 20; p. 203601
• Main Authors: Liu, Zi-Yu, Chen, Yi-Hsin, Chen, Yen-Chun, Lo, Hsiang-Yu, Tsai, Pin-Ju, Yu, Ite A, Chen, Ying-Cheng, Chen, Yong-Fan
• Format: Journal Article
• Language: English
• Published: United States 11.11.2016

We demonstrate an efficient cross-phase modulation (XPM) based on a closed-loop double-Λ system. The property of the double-Λ 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 wi...