近日，同济大学的羊亚平教授及其研究团队取得一项新进展。他们对具有电子搁置效应的二色驱动三能级原子的共振荧光进行了研究。相关研究成果已于2024年11月13日在国际知名学术期刊《物理评论A》上发表。

本研究从理论上探讨了强耦合条件下，具有电子搁置效应的双色驱动三能级原子的荧光特性。研究人员深入探究了电子搁置效应，导致多个莫洛三重峰中央峰出现两种类型峰值的物理过程。这一现象归因于非共振弱场作用下，荧光发射过程中电偶极矩的不同取向。

由于量子干涉导致的中央莫洛三重峰中宽峰的消失，电子搁置效应完全诱导出了一个纯尖峰。研究人员还揭示了由非共振弱场诱导的非对称荧光算符产生的，反相位正交噪声谱中的双模压缩效应的物理图像。

此外，通过适当增加弱场的拉比频率，可以改善双模压缩的频率范围和程度。这些结果不仅有助于在多色强耦合系统中实现电子搁置效应的实验，还为基于电子搁置效应开发非经典光谱学和量子精密测量提供了一种方案。

据悉，电子搁置效应显著提高了中能级跃迁的控制精度，使得在精密光谱学和量子计量学中，能够实现高灵敏度的荧光信号检测，从而能够更精确地研究介质的微观结构和动力学行为。

附：英文原文

Title: Resonant fluorescence of a bichromatically driven three-level atom with the electron shelving effect

Author: Jing-yang Li, Yaping Yang

Issue&Volume: 2024/11/13

Abstract: The electron shelving effect significantly improves the control accuracy of medium energy level transitions, enabling high-sensitivity fluorescence signal detection in precision spectroscopy and quantum metrology and thus allowing a more precise investigation of the microstructure and dynamical behavior of the medium. Here, we investigate theoretically the fluorescence properties of bichromatically driven three-level atoms with electron shelving effect under strong coupling conditions. The physical process by which the electron shelving effect leads to the appearance of two types of peaks in the central peaks of multiple Mollow triplets is explored. This phenomenon is attributed to the different orientations of electric dipole moments in fluorescence emission process caused by a nonresonant weak field. Due to the disappearance of the central broad peak of the central Mollow triplet caused by the quantum interference, the pure sharp peak survives completely induced by the electron shelving effect. The physical picture of the two-mode squeezing effect in out-of-phase quadrature noise spectra originating from the asymmetrical fluorescence operators induced by the nonresonant weak field is revealed. Moreover, the frequency range and degree of two-mode squeezing can be improved by appropriately increasing the Rabi frequency of the weak field. These results not only are helpful for realizing the electron shelving effect experiment in polychromatic strong-coupling systems but also provide a scheme for developing nonclassical spectroscopy and quantum precision measurement based on the electron shelving effect.

DOI: 10.1103/PhysRevA.110.053708

Source: https://journals.aps.org/pra/abstract/10.1103/PhysRevA.110.053708