近日，美国波士顿大学的Alexander V. Sergienko及其研究小组取得一项新进展。经过不懈努力，他们利用相位敏感无偏多端口实现了灵敏度增强的干涉测量。相关研究成果已于2023年5月25日在国际知名学术期刊《物理评论A》上发表。

在这项研究中，研究人员通过将光反馈（腔）与无偏多端口结合，引入了干涉测量装置，与传统的光束分束器不同，该装置允许光线从原始端口反射回来。通过用无偏多端口替换迈克尔逊干涉仪中传统的、有方向偏置的光束分束器，散射振幅的功能依赖关系发生了变化。因此，透射率对外部相位扰动的导数可以显著增大。

这大大提高了相位测量的分辨率，并且通过调节外部可控相移可以实时改变相位响应曲线。

附：英文原文

Title: Enhanced-sensitivity interferometry with phase-sensitive unbiased multiports

Author: Christopher R. Schwarze, David S. Simon, Alexander V. Sergienko

Issue&Volume: 2023/05/25

Abstract: Here we introduce interferometric devices by combining optical feedback (cavities) with unbiased multiports, which, unlike traditional beam dividers, allow light to reflect back out of the port from which it originated. By replacing the traditional, directionally biased beam-splitter in a Michelson interferometer with an unbiased multiport, the functional dependence of the scattering amplitudes changes. As a result, the derivative of transmittance with respect to an external phase perturbation can be made substantially large. This significantly enhances the resolution of phase measurement and allows the phase response curves to be altered in real time by tuning an externally controllable phase shift.

DOI: 10.1103/PhysRevA.107.052615

Source: https://journals.aps.org/pra/abstract/10.1103/PhysRevA.107.052615