Quantum metrology enhanced by the $XY$ spin interaction in a generalized Tavis-Cummings model

• URL: http://arxiv.org/abs/2307.16166v3
• Date: Tue, 9 Apr 2024 05:13:32 GMT
• Title: Quantum metrology enhanced by the $XY$ spin interaction in a generalized Tavis-Cummings model
• Authors: Yuguo Su, Wangjun Lu, Hai-Long Shi,
• Abstract summary: We explore the impact of the many-body effect on estimation precision, quantified by the quantum Fisher information (QFI) We emphasize the indispensable role of the spin anisotropy in achieving the Heisenberg-scaling precision.
• Score: 0.0
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: Quantum metrology is recognized for its capability to offer high-precision estimation by utilizing quantum resources, such as quantum entanglement. Here, we propose a generalized Tavis-Cummings model by introducing the $XY$ spin interaction to explore the impact of the many-body effect on estimation precision, quantified by the quantum Fisher information (QFI). By deriving the effective description of our model, we establish a closed relationship between the QFI and the spin fluctuation induced by the $XY$ spin interaction. Based on this exact relation, we emphasize the indispensable role of the spin anisotropy in achieving the Heisenberg-scaling precision for estimating a weak magnetic field. Furthermore, we observe that the estimation precision can be enhanced by increasing the strength of the spin anisotropy. We also reveal a clear scaling transition of the QFI in the Tavis-Cummings model with the reduced Ising interaction. Our results contribute to the enrichment of metrology theory by considering many-body effects, and they also present an alternative approach to improving the estimation precision by harnessing the power provided by many-body quantum phases.

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