20.500.12556/DKUM-90009 Precision magnetometry exploiting excited state quantum phase transitions 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 LipkinMeshkov-Glick model. magnetometry quantum phase transitions precision measurements metrologija kvantni fazni prehodi natančnost meritve true false true SciPost Foundation Angleški jezik Slovenski jezik Znanstveno delo 2024-08-21 03:39:21 2024-08-22 08:46:52 2025-04-03 14:09:24 0000-00-00 00:00:00 2024 0 0 Str. 1-33 Št. 2, št. članka 043 Letn. 17 2024 0000-00-00 Zaloznikova Objavljeno NiDoloceno 2023-07-17 2024-07-23 2024-08-09 537:006.91 204703491 10.21468/SciPostPhys.17.2.043 2542-4653 SciPostPhys_17_2_043.pdf SciPostPhys_17_2_043.pdf 1 0E1A2E3C462F84AF6355BD21E537DCBB 1cfba27aeeba0f70147efe9cb56e910677d7089950d4b776b60758b6d4b468a6 102cbbf5-5f7f-11ef-bf58-00155d000105 https://dk.um.si/Dokument.php?lang=slv&id=182831 https://www.scipost.org/SciPostPhys.17.2.043 1 36835aef-5f5e-11ef-bf58-00155d000105 https://dk.um.si/Dokument.php?lang=slv&id=182828 Univerza v Mariboru 0 0 0