Large Cross-Phase Modulations at the Few-Photon Level

被引：56

作者：

Liu, Zi-Yu ^{[1
]}

Chen, Yi-Hsin ^{[2
,3
]}

Chen, Yen-Chun ^{[1
]}

Lo, Hsiang-Yu ^{[1
]}

Tsai, Pin-Ju ^{[1
]}

Yu, Ite A. ^{[2
,3
]}

Chen, Ying-Cheng ^{[4
]}

Chen, Yong-Fan ^{[1
]}

机构：

[1] Natl Cheng Kung Univ, Dept Phys, Tainan 70101, Taiwan

[2] Natl Tsing Hua Univ, Dept Phys, Hsinchu 30013, Taiwan

[3] Natl Tsing Hua Univ, Frontier Res Ctr Fundamental & Appl Sci Matters, Hsinchu 30013, Taiwan

[4] Acad Sinica, Inst Atom & Mol Sci, Taipei 10617, Taiwan

来源：

PHYSICAL REVIEW LETTERS | 2016年 / 117卷 / 20期

关键词：

ELECTROMAGNETICALLY INDUCED TRANSPARENCY; NONLINEAR OPTICS; LIGHT; PULSES; SHIFTS; ATOMS;

D O I：

10.1103/PhysRevLett.117.203601

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

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 laser beams. With this scheme, we observe a pi-level phase shift with two pulses, both consisting of eight photons in cold rubidium atoms. Such a novel scheme provides a simple route to generate strong interactions between photons and may have potential applications in all-optical quantum signal processing.

引用

页数：5

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