近日，中国科学技术大学的彭新华及其研究团队取得一项新进展。经过不懈努力，他们揭示非重叠激光束之间的自旋噪声诱导同步性。相关研究成果已于2024年9月10日在国际知名学术期刊《物理评论A》上发表。

该研究团队提出并展示了一种通过内在自旋噪声诱导非重叠激光束之间同步的方法。两束线性极化且非重叠的激光束穿过飞行的非极化碱金属原子蒸汽，并通过原子-光相互作用捕获其相关的噪声特性，从而实现两束激光束之间的同步。

利用相关谱，研究人员展示了在原子拉莫尔频率下两束激光束之间近乎同相的同步，该同步可通过磁场强度轻松地在宽频率范围内调节。

此外，研究人员证明了同步程度随原子密度的增加而提高，并且当两束激光束所在区域的拉莫尔频率不同时，同步仍然有效。这一方法可能对安全密钥分发和安全通信等应用有所帮助。

附：英文原文

Title: Spin-noise-induced synchronization between non-overlapping laser beams

Author: Shiming Song, Min Jiang, Yushu Qin, Ze Wu, Haowen Su, Ren-bao Liu, Dieter Suter, Xinhua Peng

Issue&Volume: 2024/09/10

Abstract: Noise-induced synchronizations have led to diverse phenomena and applications. Here, we propose and demonstrate an approach towards inducing synchronizations between non-overlapping laser beams by intrinsic spin noise. Two linearly polarized and non-overlapping laser beams propagate through a vapor of flying unpolarized alkali atoms and capture their correlated noise properties by the atom-light interaction, resulting in synchronization between the two laser beams. Using correlation spectra, we demonstrate the nearly in phase synchronization at the atomic Larmor frequency between the two laser beams, which can easily be varied across a wide frequency range by the magnetic-field strength. Moreover, we show that the degree of synchronization increases with the atomic density, and the synchronization remains effective when the Larmor frequencies in the regions of the two laser beams are different. Our method may be useful for applications like secure key distribution and secure communication.

DOI: 10.1103/PhysRevA.110.033105

Source: https://journals.aps.org/pra/abstract/10.1103/PhysRevA.110.033105