Critical quantum thermometry and its feasibility in spin systems

Year: 2022

Type: article

Abstract: 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.

Source: Quantum

DOI: 10.22331/q-2022-09-19-808

Authors: Enes Aybar, Artur Niezgoda, Safoura S. Mirkhalaf, Morgan W. Mitchell, Daniel Benedicto Orenes, Emilia Witkowska

Institutions: Institute of Photonic Sciences, Barcelona Institute of Science and Technology, University of Warsaw, University of Tehran, Institute for Research in Fundamental Sciences, Institució Catalana de Recerca i Estudis Avançats, Institute of Physics

Language: English

Topic: Quantum many-body systems

Subfield: Atomic and Molecular Physics, and Optics

Field: Physics and Astronomy

Domain: Physical Sciences

Open Access status: gold

Estimated APC paid: $215

Funders: European Commission, Generalitat de Catalunya, Narodowym Centrum Nauki, Ministerio de Ciencia e Innovación, QuantERA, Horizon 2020 Framework Programme, Agencia Estatal de Investigación, European Metrology Programme for Innovation and Research

OpenAlex ID: W4226427690