期刊
ENTROPY
卷 24, 期 8, 页码 -出版社
MDPI
DOI: 10.3390/e24081015
关键词
finite component phase transition; quantum metrology; quantum Rabi model; nonlinear coupling
资金
- National Natural Science Foundation of China [11974151]
- German Research Foundation (Deutsche Forschungsgemeinschaft) [439943572]
The quantum Rabi model with linear coupling exhibits a second-order phase transition at zero mode frequency, enhancing quantum metrology in few-body systems. However, the inclusion of a nonlinear coupling term in the model leads to a first-order-like phase transition at finite frequency, resulting in higher measurement precision and avoiding the detrimental slowing-down effect near the critical point. When a bias term is added, the system can be used as a fluxmeter or magnetometer in circuit QED platforms.
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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