Operational significance of nonclassicality in nonequilibrium Gaussian quantum thermometry
Abstract
We provide new operational significance of nonclassicality in nonequilibrium temperature estimation of bosonic baths with Gaussian probe states and Gaussian dynamics. We find a bound on the thermometry performance using classical probe states. Then we show that by using nonclassical probe states, single-mode and two-mode squeezed vacuum states, one can profoundly improve the classical limit. Interestingly, we observe that this improvement can also be achieved by using Gaussian measurements. Hence, we propose a fully Gaussian protocol for enhanced thermometry, which can simply be realized and used in quantum optics platforms.
Keywords
Cite
@article{arxiv.2207.10742,
title = {Operational significance of nonclassicality in nonequilibrium Gaussian quantum thermometry},
author = {Safoura S. Mirkhalaf and Mohammad Mehboudi and Zohre Nafari Qaleh and Saleh Rahimi-Keshari},
journal= {arXiv preprint arXiv:2207.10742},
year = {2023}
}
Comments
In the updated version: (i)A new coauthor has joined the collaboration. (ii)New simulations are added. (iii)We also concretely prove the Lamb-shift is temperature independent