Enhanced sensing of anharmonicities in a gain-based anti-PT symmetric system

doi:10.1088/1674-1056/ad8a4d

中国物理B ›› 2024, Vol. 33 ›› Issue (12): 124201-124201.doi: 10.1088/1674-1056/ad8a4d

Enhanced sensing of anharmonicities in a gain-based anti-PT symmetric system

Ya-Wei Zeng(曾亚伟), Tian-Le Yang(杨天乐), Qi-Yin Lin(林琪茵), and Wan-Jun Su(苏万钧)†

Fujian Key Laboratory of Quantum Information and Quantum Optics and Department of Physics, Fuzhou University, Fuzhou 350116, China

收稿日期:2024-09-08 修回日期:2024-10-10 接受日期:2024-10-23 出版日期:2024-12-15 发布日期:2024-11-26
通讯作者: Wan-Jun Su E-mail:wanjunsu@fzu.edu.cn
基金资助:
Project supported by the National Natural Science Foundation of China (Grant Nos. 11704058 and 12174058).

Enhanced sensing of anharmonicities in a gain-based anti-PT symmetric system

Ya-Wei Zeng(曾亚伟), Tian-Le Yang(杨天乐), Qi-Yin Lin(林琪茵), and Wan-Jun Su(苏万钧)†

Fujian Key Laboratory of Quantum Information and Quantum Optics and Department of Physics, Fuzhou University, Fuzhou 350116, China

Received:2024-09-08 Revised:2024-10-10 Accepted:2024-10-23 Online:2024-12-15 Published:2024-11-26
Contact: Wan-Jun Su E-mail:wanjunsu@fzu.edu.cn
Supported by:
Project supported by the National Natural Science Foundation of China (Grant Nos. 11704058 and 12174058).

摘要/Abstract

摘要： We study the enhanced sensing of weak anharmonicities in a gain-based cavity-magnon-waveguide coupled system. By dissipatively coupling the two subsystems through a mediating waveguide, the Hamiltonian of the system is tailored to be anti-parity-time symmetric. Unique to the gain condition, the eigenvalues exhibit two singularities with linewidth suppression, distinguishing them from those of gain-free systems. Under the gain condition, a counter-intuitive bistable signature emerges even at low drive powers. As the effective gain approaches a certain value, this bistability yields a significantly enhanced spin-current response of the magnon mode. Consequently, the sensitivity, quantified by an enhancement factor, is enhanced remarkably compared to the linewidth suppression scenario. Moreover, the high enhancement factor can be sustained over a broad gain-bandwidth and also stays large even when the coherent coupling becomes considerably strong. Based on the integrated cavity-magnon-waveguide systems, this scheme can be used for sensing different physical quantities related to the Kerr-type nonlinearity and has potential applications in high-precision measuring microwave-signal nonlinearities.

关键词: sensing, nonlinearities, anti-parity-time symmetry, bistability

Abstract: We study the enhanced sensing of weak anharmonicities in a gain-based cavity-magnon-waveguide coupled system. By dissipatively coupling the two subsystems through a mediating waveguide, the Hamiltonian of the system is tailored to be anti-parity-time symmetric. Unique to the gain condition, the eigenvalues exhibit two singularities with linewidth suppression, distinguishing them from those of gain-free systems. Under the gain condition, a counter-intuitive bistable signature emerges even at low drive powers. As the effective gain approaches a certain value, this bistability yields a significantly enhanced spin-current response of the magnon mode. Consequently, the sensitivity, quantified by an enhancement factor, is enhanced remarkably compared to the linewidth suppression scenario. Moreover, the high enhancement factor can be sustained over a broad gain-bandwidth and also stays large even when the coherent coupling becomes considerably strong. Based on the integrated cavity-magnon-waveguide systems, this scheme can be used for sensing different physical quantities related to the Kerr-type nonlinearity and has potential applications in high-precision measuring microwave-signal nonlinearities.

Key words: sensing, nonlinearities, anti-parity-time symmetry, bistability

中图分类号: (Optical bistability, multistability, and switching, including local field effects)

42.65.Pc

47.20.Ky (Nonlinearity, bifurcation, and symmetry breaking) 84.40.Xb (Telemetry: remote control, remote sensing; radar)

Ya-Wei Zeng(曾亚伟), Tian-Le Yang(杨天乐), Qi-Yin Lin(林琪茵), and Wan-Jun Su(苏万钧). Enhanced sensing of anharmonicities in a gain-based anti-PT symmetric system[J]. 中国物理B, 2024, 33(12): 124201-124201.

Ya-Wei Zeng(曾亚伟), Tian-Le Yang(杨天乐), Qi-Yin Lin(林琪茵), and Wan-Jun Su(苏万钧). Enhanced sensing of anharmonicities in a gain-based anti-PT symmetric system[J]. Chin. Phys. B, 2024, 33(12): 124201-124201.

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Enhanced sensing of anharmonicities in a gain-based anti-PT symmetric system

Enhanced sensing of anharmonicities in a gain-based anti-PT symmetric system

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