基于Sagnac干涉仪中不定因果序的几何相位测量
Measuring Geometric Phase based on Indefinite Causal Order in a Sagnac Interferometer
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- Universidade Federal de Santa Catarina（圣卡塔琳娜联邦大学）
- University of Glasgow（格拉斯哥大学）
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中文总结 AI 辅助
本文利用Sagnac干涉仪中顺逆时针光路反向穿越的特性，实现不定因果序的经典演示，并通过单次测量提取两个非对易偏振操作引起的几何相位，为快速偏振表征及手性介质光学活性检测提供新思路。
中文摘要 AI 辅助
Sagnac干涉仪是精密测量的重要工具。共路噪声的抵消确保了其对外部扰动的高度稳定性，而其对旋转的敏感性则为激光陀螺仪提供了基础。在此，我们强调Sagnac干涉仪另一个较少被探索的特性：对于顺时针和逆时针传播的光分量，光学元件以相反的顺序被穿过。这为探索不定因果序的经典实现提供了机会，其中序列内事件的顺序不是固定的。我们利用这一概念，通过单次测量来识别与两个非对易偏振操作相关的几何相位。这一想法可能有助于快速确定手性介质中的偏振操作或光学活性，但最重要的是，它为不定因果序提供了一个几何示例。
英文摘要
Sagnac interferometers are important tools for precision measurements. Cancellation of common-path noise ensures a high degree of stability against external perturbations, while their sensitivity to rotations provides the basis of laser gyroscopes. Here we highlight another, less explored feature of Sagnac interferometers: the fact that optical elements are traversed in reverse order for clockwise and counterclockwise propagating light components. This provides the opportunity to explore a classical realization of indefinite causal order, where the order of events within a sequence is not fixed. We explore this concept to identify the geometric phase associated with two non-commuting polarization operations with a single measurement. This idea may have applications for the rapid determination of polarization manipulations or optical activity within chiral media, but foremost it provides a geometric illustration of indefinite causal order.
