Criticality-Enhanced Quantum Sensing in the Anisotropic Quantum Rabi Model

• URL: http://arxiv.org/abs/2302.13676v1
• Date: Mon, 27 Feb 2023 11:20:31 GMT
• Title: Criticality-Enhanced Quantum Sensing in the Anisotropic Quantum Rabi Model
• Authors: Xin Zhu, Jia-Hao L\"u, Wen Ning, Fan Wu, Li-Tuo Shen, Zhen-Biao Yang, Shi-Biao Zheng
• Abstract summary: We generalize the framework for criticality-enhanced quantum sensing by the quantum Rabi model to its anisotropic counterpart. We find that the contributions of the rotating-wave and counterrotating-wave interaction terms are symmetric at the limit of the infinite ratio of qubit frequency to field frequency.
• Score: 6.284204043713657
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: Quantum systems that undergo quantum phase transitions exhibit divergent susceptibility and can be exploited as probes to estimate physical parameters. We generalize the dynamic framework for criticality-enhanced quantum sensing by the quantum Rabi model (QRM) to its anisotropic counterpart and derive the correspondingly analytical expressions for the quantum Fisher information (QFI). We find that the contributions of the rotating-wave and counterrotating-wave interaction terms are symmetric at the limit of the infinite ratio of qubit frequency to field frequency, with the QFI reaching a maximum for the isotropic quantum Rabi model. At finite frequency scaling, we analytically derive the inverted variance of higher-order correction and find that it is more affected by the rotating-wave coupling than by the counterrotating-wave coupling.

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