Temperature-Enhanced Critical Quantum Metrology

Autor:	Ostermann, Laurin, Gietka, Karol
Rok vydání:	2023
Předmět:	Quantum Physics
Druh dokumentu:	Working Paper
Popis:	We show that the performance of critical quantum metrology protocols, counter-intuitively, can be enhanced by finite temperature. We consider a toy-model squeezing Hamiltonian, the Lipkin-Meshkov-Glick model and the paradigmatic Ising model. We show that the temperature enhancement of the quantum Fisher information can be achieved by adiabatic preparation of the critical state and by preparing it directly in the proximity of the critical point. We also find a relatively simple, however, non-optimal measurement capable of harnessing finite temperature to increase the parameter estimation sensitivity. Therefore, we argue that temperature can be considered as a resource in critical quantum metrology. Comment: 6 pages, 2 figures, improved presentation and discussions
Databáze:	arXiv
Externí odkaz:	http://arxiv.org/abs/2312.04176 Zobrazit plný text záznamu View this record from Arxiv