大连理工大学于长水团队近日研究了利用合成磁性增强光机力传感。这一研究成果发表在2025年5月5日出版的《物理评论A》杂志上。

在多机械模式光机系统的精确力传感中，相干干涉会使某些简并振动模式与腔场解耦，导致测量信号的信息不完整。研究组提出了一种方案，利用通过调谐声子跳跃相互作用实现的合成磁性来增强和控制光机力传感中的检测带宽。通过在断开和未断开的暗模式之间切换，这种方法有效地管理了响应带宽，并表现出有趣的额外噪声特性。 

具体来说，当暗模式保持不变时，热噪声是稳健的，并且降低到标准设备的一半。相比之下，当暗模式被破坏时，热噪声在机械共振下显著增加，但在有效检测频率下与暗模式未被破坏时保持不变。此外，该方案提供了放大机械响应的双重好处，同时抑制了额外的噪声，有可能超过标准的量子极限。

附：英文原文

Title: Enhancing optomechanical force sensing utilizing synthetic magnetism

Author: Ding-hui Xu, Zheng Liu, Chang-shui Yu

Issue&Volume: 2025/05/05

Abstract: In precision force sensing of multimechanical mode optomechanical systems, coherent interference can decouple certain degenerate vibrational modes from the cavity field, leading to incomplete information regarding the measured signal. In this paper, we propose a scheme to enhance and control the detection bandwidth in optomechanical force sensing by exploiting synthetic magnetism achieved through tuning phonon-hopping interactions. By toggling between broken and unbroken dark mode, this approach effectively manages the response bandwidth and exhibits intriguing additional noise characteristics. Specifically, when the dark mode remains unbroken, the thermal noise is robust and reduced to half of that of a standard device. In contrast, when the dark mode is broken, thermal noise increases substantially at mechanical resonance but remains the same as when the dark mode is unbroken at effective detection frequencies. Moreover, our scheme offers the dual benefit of amplifying the mechanical response while suppressing additional noise, with the potential to surpass the standard quantum limit.

DOI: 10.1103/PhysRevA.111.053508

Source: https://journals.aps.org/pra/abstract/10.1103/PhysRevA.111.053508