Critical quantum metrology in the non-linear quantum Rabi model

  • 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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Author:Zu-Jian Ying, Simone Felicetti, Gang Liu, Daniel BraakORCiDGND
Frontdoor URL
Parent Title (English):Entropy
Place of publication:Basel
Date of first Publication:2022/07/22
Publishing Institution:Universität Augsburg
Release Date:2022/08/25
Tag:finite component phase transition; quantum metrology; quantum Rabi model; nonlinear coupling
First Page:1015
Institutes:Mathematisch-Naturwissenschaftlich-Technische Fakultät
Mathematisch-Naturwissenschaftlich-Technische Fakultät / Institut für Physik
Mathematisch-Naturwissenschaftlich-Technische Fakultät / Institut für Physik / Lehrstuhl für Experimentalphysik VI
Dewey Decimal Classification:5 Naturwissenschaften und Mathematik / 53 Physik / 530 Physik
Licence (German):CC-BY 4.0: Creative Commons: Namensnennung (mit Print on Demand)