TY  - JOUR
PB  - SciPost Foundation
DO  - 10.21468/SciPostPhys.17.2.043
TI  - Precision magnetometry exploiting excited state quantum phase transitions
PY  - 2024/08/09
UR  - https://scipost.org/SciPostPhys.17.2.043
JF  - SciPost Physics
JA  - SciPost Phys.
VL  - 17
IS  - 2
SP  - 043
A1  - Qian, Wang
AU  - Marzolino, Ugo
AB  - Critical behaviour in phase transitions is a resource for enhanced precision metrology. The reason is that the function, known as Fisher information, is superextensive at critical points, and, at the same time, quantifies performances of metrological protocols. Therefore, preparing metrological probes at phase transitions provides enhanced precision in measuring the transition control parameter. We focus on the Lipkin-Meshkov-Glick model that exhibits excited state quantum phase transitions at different magnetic fields. Resting on the model spectral properties, we show broad peaks of the Fisher information, and propose efficient schemes for precision magnetometry. The Lipkin-Meshkov-Glick model was first introduced for superconductivity and for nuclear systems, and recently realised in several condensed matter platforms. The above metrological schemes can be also exploited to measure microscopic properties of systems able to simulate the Lipkin-Meshkov-Glick model.
ER  -

@Article{10.21468/SciPostPhys.17.2.043,
	title={{Precision magnetometry exploiting excited state quantum phase transitions}},
	author={Qian Wang and Ugo Marzolino},
	journal={SciPost Phys.},
	volume={17},
	pages={043},
	year={2024},
	publisher={SciPost},
	doi={10.21468/SciPostPhys.17.2.043},
	url={https://scipost.org/10.21468/SciPostPhys.17.2.043},
}