array(2) { ["lab"]=> string(4) "1680" ["publication"]=> string(5) "15285" } Critical Quantum Metrology in the Non-Linear Quantum Rabi Model - 应祖建课题组 | LabXing

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大学 兰州大学 / 物理科学与技术学院
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Critical Quantum Metrology in the Non-Linear Quantum Rabi Model

2022
期刊 Entropy
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The quantum Rabi model (QRM) with linear coupling between light mode and qubit exhibits the analog of a second-order phase transition for vanishing mode frequency which allows for criticality-enhanced quantum metrology in a few-body system. We show that the QRM including a nonlinear coupling term exhibits much higher measurement precisions due to its first-order-like phase transition at finite frequency, avoiding the detrimental slowing-down effect close to the critical point of the linear QRM. When a bias term is added to the Hamiltonian, the system can be used as a fluxmeter or magnetometer if implemented in circuit QED platforms.

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