论文标题
阐明光子传感的特殊点贡献
Clarification of exceptional point contribution for photonic sensing
论文作者
论文摘要
特殊点可以与非富甲光子系统同时结合欧吉值和本征载体的合并。随着响应的增强，已经提出了出色的点来提高光子传感的性能。最近，关于特殊点的实际感应优势存在激烈的争论。主要问题是，在特殊点上，内在噪声也会放大。在这里，我们旨在阐明光子传感的特殊点的贡献。这是通过分析条件实现线性非热光子系统中不同量子渔民信息来实现的。我们表明，量子Fisher信息的差异是激光阈值而不是特殊点的结果。但是，特殊点对应于激光阈值在多个光子模式上同时实现的条件。因此，特殊点可以进一步提高激光阈值的灵敏度。另一方面，仅凭特殊点无法提供感应优势。
Exceptional points, with simultaneous coalescence of eigen-values and eigen-vectors, can be realized with non-Hermitian photonic systems. With the enhanced response, exceptional points have been proposed to improve the performance of photonic sensing. Recently, there are intense debate about the actual sensing advantage of exceptional points. The major concern is that intrinsic noise is also amplified at exceptional points. Here, we aim to clarify the contribution of exceptional points for photonic sensing. This is achieved by analyzing the condition to realize divergent quantum Fisher information in linear non-Hermitian photonic systems. We show that the divergence of quantum Fisher information is the result of lasing threshold, instead of exceptional points. However, exceptional points correspond to the condition that lasing threshold is simultaneously achieved across multiple photonic modes. Therefore, exceptional points can further improve the sensitivity on top of lasing threshold. On the other hand, exceptional points alone cannot provide sensing advantage.
