Enhancement of quantum sensing in a dissipatively coupled two-mode system

• URL: http://arxiv.org/abs/2509.00724v2
• Date: Tue, 04 Nov 2025 08:28:52 GMT
• Title: Enhancement of quantum sensing in a dissipatively coupled two-mode system
• Authors: Hao-Wen Zhang, Dong-Yang Wang, Cheng-Hua Bai, Tian-Xiang Lu, Shi-Lei Su,
• Abstract summary: Quantum sensing near exceptional points (EPs) in non-Hermitian systems has shown promising sensitivity enhancements.<n>We introduce a simplified anti-parity-time (anti-PT) symmetric platform consisting of two independently cavities.<n>We demonstrate a significantly enhanced sensing response at the EPs compared to non-EP configurations.
• Score: 1.831509200031995
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: 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.

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