The non-Hermitian system has been widely studied recently in various fields from quantum physics to condensed matter, in which the “exceptional point” (EP) as an essential feature of the systems can be used to design sensors, for example, a mass sensor to detect the mass of nano-objects. Inspired by the LIGO gravitational wave detector by using squeezed states of light, we here aim to enhance the sensitivity of the mass sensor by a nonlinear laser drive. The system consists of two optomechanical cavities that are mechanically coupled and driven nonlinearly by detuned lasers (squeezed lasers). Compared to the case of linear drive, our results are more sensitive to the mass, and the split width of the eigenvalues at EP can be further increased by using the squeezed lasers. The sensitivity enhancement factor and optical damping of resonators are also calculated and discussed, and a great improvement is found consequently. This work would provide a wider view for the new quantum sensors in order to be applied in the fields of nanoparticle detection, precision measurement, and quantum metrology.

中文翻译：

---

使用处于挤压状态的激光提高光机械质量传感器的灵敏度

非厄米系统最近在从量子物理到凝聚态的各个领域得到了广泛的研究，其中“例外点”（EP）作为系统的基本特征可以用于设计传感器，例如质量传感器检测纳米物体的质量。受 LIGO 引力波探测器使用光的压缩状态的启发，我们的目标是通过非线性激光驱动来提高质量传感器的灵敏度。该系统由两个光机械腔组成，它们通过失谐激光器（压缩激光器）进行机械耦合和非线性驱动。与线性驱动的情况相比，我们的结果对质量更敏感，并且通过使用挤压激光器可以进一步增加 EP 处特征值的分裂宽度。还计算和讨论了谐振器的灵敏度增强因子和光学阻尼，并发现了很大的改进。这项工作将为新型量子传感器提供更广阔的视野，以应用于纳米粒子检测、精密测量和量子计量领域。