Critical quantum thermometry and its feasibility in spin systems

In this work, we study temperature sensing with finite-sized strongly correlated systems exhibiting quantum phase transitions. We use the quantum Fisher information (QFI) approach to quantify the sensitivity in the temperature estimation, and apply a finite-size scaling framework to link this sensit...

Full description

Saved in:
Bibliographic Details
Published inQuantum (Vienna, Austria) Vol. 6; p. 808
Main Authors Aybar, Enes, Niezgoda, Artur, Mirkhalaf, Safoura S., Mitchell, Morgan W., Benedicto Orenes, Daniel, Witkowska, Emilia
Format Journal Article
LanguageEnglish
Published Verein zur Förderung des Open Access Publizierens in den Quantenwissenschaften 19.09.2022
Online AccessGet full text

Cover

More Information
Summary:In this work, we study temperature sensing with finite-sized strongly correlated systems exhibiting quantum phase transitions. We use the quantum Fisher information (QFI) approach to quantify the sensitivity in the temperature estimation, and apply a finite-size scaling framework to link this sensitivity to critical exponents of the system around critical points. We numerically calculate the QFI around the critical points for two experimentally-realizable systems: the spin-1 Bose-Einstein condensate and the spin-chain Heisenberg XX model in the presence of an external magnetic field. Our results confirm finite-size scaling properties of the QFI. Furthermore, we discuss experimentally-accessible observables that (nearly) saturate the QFI at the critical points for these two systems.
ISSN:2521-327X
2521-327X
DOI:10.22331/q-2022-09-19-808