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 |
|---|---|
| URN: | urn:nbn:de:bvb:384-opus4-973201 |
| Frontdoor URL | https://opus.bibliothek.uni-augsburg.de/opus4/97320 |
| ISSN: | 1099-4300OPAC |
| Parent Title (English): | Entropy |
| Publisher: | MDPI |
| Place of publication: | Basel |
| Type: | Article |
| Language: | English |
| Date of first Publication: | 2022/07/22 |
| Publishing Institution: | Universität Augsburg |
| Release Date: | 2022/08/25 |
| Tag: | finite component phase transition; nonlinear coupling; quantum Rabi model; quantum metrology |
| Volume: | 24 |
| Issue: | 8 |
| First Page: | 1015 |
| DOI: | https://doi.org/10.3390/e24081015 |
| 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 |
