High-order exceptional points and stochastic resonance in pseudo-Hermitian systems

Shirin Panahi; Li-Li Ye; Ying-Cheng Lai

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arXiv · 2410.13724

High-order exceptional points and stochastic resonance in pseudo-Hermitian systems

Shirin Panahi·Li-Li Ye·Ying-Cheng Lai

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Abstract

Exceptional points, a remarkable phenomenon in physical systems, have been exploited for sensing applications. It has been demonstrated recently that it can also utilize as sensory threshold in which the interplay between exceptional-point dynamics and noise can lead to enhanced performance. Most existing works focused on second-order exceptional points. We investigate the stochastic dynamics associated with high-order exceptional points with a particular eye towards optimizing sensing performance by developing a theoretical framework based on pseudo-Hermiticity. Our analysis reveals three distinct types of frequency responses to external perturbations. A broad type of stochastic resonance is uncovered where, as the noise amplitude increases, the signal-to-noise ratio reaches a global maximum rapidly but with a slow decaying process afterwards, indicating achievable high performance in a wide range of the noise level. These results suggest that stochastic high-order exceptional-point dynamics can be exploited for applications in signal processing and sensor technologies.

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Shirin Panahi, Li-Li Ye, Ying-Cheng Lai. 2024-10-17. High-order exceptional points and stochastic resonance in pseudo-Hermitian systems. https://arxiv.org/abs/2410.13724

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