| SPECIAL TOPIC — Quantum computing and quantum sensing |
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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 |
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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.
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Received: 08 September 2024
Revised: 10 October 2024
Accepted manuscript online: 23 October 2024
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PACS:
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42.65.Pc
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(Optical bistability, multistability, and switching, including local field effects)
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47.20.Ky
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(Nonlinearity, bifurcation, and symmetry breaking)
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84.40.Xb
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(Telemetry: remote control, remote sensing; radar)
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| Fund: Project supported by the National Natural Science Foundation of China (Grant Nos. 11704058 and 12174058). |
Corresponding Authors:
Wan-Jun Su
E-mail: wanjunsu@fzu.edu.cn
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Cite this article:
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 2024 Chin. Phys. B 33 124201
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