文献类型：期刊文献

英文题名：Ultra-strong nonreciprocal amplification with hot atoms

作者：Yang, Hang[1];Zhang, Shicheng[1];Niu, Yueping[1,2];Gong, Shangqing[1,2]

机构：[1]East China Univ Sci & Technol, Sch Phys, Shanghai 200237, Peoples R China;[2]Shanghai Engn Res Ctr Hierarch Nanomat, Shanghai 200237, Peoples R China

年份：2022

卷号：515

外文期刊名：OPTICS COMMUNICATIONS

收录：;EI(收录号：20221311851236);WOS:【SCI-EXPANDED(收录号:WOS:000790763600018)】；

基金：We acknowledge the support of the National Natural Science Foun-dation of China (Grants No. 12034007, 11974109 and 12004112) and Shanghai Sailing Program, China (Grant No. 20YF1410800) . The work is also sponsored by Chenguang Program supported by Shanghai Education Development Foundation, China and Shanghai Municipal Education Commission, China (Grant No. 20CG35) .

语种：英文

外文关键词：Magnetic-free; Nonreciprocal amplification; Four-wave mixing; Hot atoms

摘要：Optical nonreciprocity plays an important role in optical communication and signal processing. Here, we propose and demonstrate a magnetic-free optical nonreciprocal amplification based on a far-detuned four-wave mixing process in hot atoms. The absorption of the probe field can be significantly reduced by the large detuning. In our experiment, with just one pump field, an ultra-strong forward gain of 45 dB is achieved while the backward one keeps a near unit transmission. The experimental realization of ultra-strong nonreciprocal amplification may have applications for the generation of strong nonreciprocal quantum correlations.