Sensitivity Enhancement near High-Order Exceptional Points via Dissipative Couplings

• URL: http://arxiv.org/abs/2606.10865v1
• Date: Tue, 09 Jun 2026 13:44:29 GMT
• Title: Sensitivity Enhancement near High-Order Exceptional Points via Dissipative Couplings
• Abstract summary: High-order exceptional points (EPs) emerging in non-Hermitian systems have attracted broad interest for their significantly enhanced sensitivity to perturbations.<n>We propose a four-channel dissipative coupling model that supports both fourth-order exceptional surfaces and second-order exceptional volumes.
• Score: 5.506247728565412
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: High-order exceptional points (EPs) emerging in non-Hermitian systems have attracted broad interest for their significantly enhanced sensitivity to perturbations. However, quantum sensing schemes based on high-order EPs remain scarce, due to the experimental challenge of fine-tuning the system to such an extremely sensitive isolated point. Here we propose a four-channel dissipative coupling model that supports both fourth-order exceptional surfaces and second-order exceptional volumes. This non-Hermitian model can be realized in a thermal atomic system, and its complex energy spectra can be determined via electromagnetically induced transparency spectroscopy. The proposed model exhibits a characteristic fourth-order response to multiple physical quantities such as the laser detuning and the distance between optical channels, significantly surpassing the response of second-order EPs. We further reveal the sensitivity-robustness trade-off under experimental noise. Our work opens a route toward high-performance sensing leveraging higher-order EPs.

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