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| Main Authors: | , , , , |
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| Format: | Preprint |
| Published: |
2025
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| Subjects: | |
| Online Access: | https://arxiv.org/abs/2509.00724 |
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| _version_ | 1866915817029894144 |
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| author | Zhang, Hao-Wen Wang, Dong-Yang Bai, Cheng-Hua Lu, Tian-Xiang Su, Shi-Lei |
| author_facet | Zhang, Hao-Wen Wang, Dong-Yang Bai, Cheng-Hua Lu, Tian-Xiang Su, Shi-Lei |
| contents | Quantum sensing near exceptional points (EPs) in non-Hermitian systems has shown promising sensitivity enhancements. However, practical applications are often hindered by structural complexity and strict parameter constraints. In this work, we introduce a simplified anti-parity-time (anti-PT) symmetric platform consisting of two independently cavities, which are indirectly coupled to each other by a shared dissipative environment. We demonstrate a significantly enhanced sensing response at the EPs compared to non-EP configurations. This improvement is attributed to the dominant second-order term in the Laurent series expansion of the eigenvalue response to external perturbations- a characteristic feature of higher-order singularities at EPs. This mechanism not only reinforces the foundation for sensitivity enhancement but also offers a structurally compact and robust strategy for quantum sensing. Our results underscore the potential of anti-PT symmetric systems in enabling high-precision sensing technologies and bridging non-Hermitian physics with scalable photonic device platforms. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2509_00724 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Enhancement of quantum sensing in a dissipatively coupled two-mode system Zhang, Hao-Wen Wang, Dong-Yang Bai, Cheng-Hua Lu, Tian-Xiang Su, Shi-Lei Quantum Physics Quantum sensing near exceptional points (EPs) in non-Hermitian systems has shown promising sensitivity enhancements. However, practical applications are often hindered by structural complexity and strict parameter constraints. In this work, we introduce a simplified anti-parity-time (anti-PT) symmetric platform consisting of two independently cavities, which are indirectly coupled to each other by a shared dissipative environment. We demonstrate a significantly enhanced sensing response at the EPs compared to non-EP configurations. This improvement is attributed to the dominant second-order term in the Laurent series expansion of the eigenvalue response to external perturbations- a characteristic feature of higher-order singularities at EPs. This mechanism not only reinforces the foundation for sensitivity enhancement but also offers a structurally compact and robust strategy for quantum sensing. Our results underscore the potential of anti-PT symmetric systems in enabling high-precision sensing technologies and bridging non-Hermitian physics with scalable photonic device platforms. |
| title | Enhancement of quantum sensing in a dissipatively coupled two-mode system |
| topic | Quantum Physics |
| url | https://arxiv.org/abs/2509.00724 |