文献类型：期刊文献

英文题名：Power-preserving reduction of laser linewidth via cavity quantum squeezing

作者：Sheng, Tianze[1,2];Zhang, Lida[2];Niu, Yueping[1,2];Gong, Shangqing[1,2,3]

机构：[1]East China Univ Sci & Technol, Sch Mat Sci & Engn, Shanghai 200237, Peoples R China;[2]East China Univ Sci & Technol, Sch Phys, Shanghai 200237, Peoples R China;[3]Shanghai Frontiers Sci Ctr Optogenet Tech Cell Met, Shanghai 200237, Peoples R China

年份：2025

卷号：112

期号：5

起止页码：1

外文期刊名：PHYSICAL REVIEW A

收录：;EI(收录号：20260119856484);WOS:【SCI-EXPANDED(收录号:WOS:001619380500019)】；

基金：This work was supported by the National Natural Sci-ence Foundation of China (Grants No. 12034007 and No. 12374327) , Innovation Program for Quantum Science and Technology (Grant No. 2021ZD0300802) , Major Project of Shanghai Municipal Education Commission (Grant No. 2023ZKZD39) , and Program of Shanghai Academic Research Leader (Grant No. 21XD1400700) .

语种：英文

外文关键词：Laser optics

摘要：We propose a protocol to reduce the linewidth of a weak laser field without power loss based on a quantum squeezing process. By taking advantage of the frequency-dependent noiseless amplification mechanism of the cavity squeezing process, the linewidth of the output field from the cavity can be evidently narrowed in comparison to that of the incident laser field. The reduction effect depends on the strength of the cavity squeezing process, and order-of-magnitude reduction can be made possible in the vicinity of the lasing threshold. Moreover, we find a simple and favorable scaling law for the output field from the cascade system consisting of M identical nonlinear cavities at certain conditions. Our results may be beneficial for a variety of applications where narrow linewidth is crucial, such as quantum metrology and sensing.