Precision magnetometry exploiting excited state quantum phase transitions
Qian Wang, Ugo Marzolino
SciPost Phys. 17, 043 (2024) · published 9 August 2024
- doi: 10.21468/SciPostPhys.17.2.043
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Abstract
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.
Authors / Affiliations: mappings to Contributors and Organizations
See all Organizations.- 1 2 Wang Qian,
- 3 4 5 Ugo Marzolino
- 1 浙江师范大学 / Zhejiang Normal University [ZJNU]
- 2 Univerza v Mariboru / University of Maribor
- 3 Scuola Normale Superiore di Pisa
- 4 Università degli Studi di Trieste / University of Trieste [UNITS]
- 5 INFN Sezione di Trieste / INFN Trieste