Quantum metrology and coherence
Quantum Physics
2021-10-27 v2
Abstract
We address the relation between quantum metrological resolution and coherence. We examine this dependence in two manners: we develop a quantum Wiener-Kintchine theorem for a suitable model of quantum ruler, and we compute the Fisher information. The two methods have the virtue of including both the contributions of probe and measurement on an equal footing. We illustrate this approach with several examples of linear and nonlinear metrology. Finally, we optimize resolution regarding coherence as a finite resource.
Cite
@article{arxiv.2102.03223,
title = {Quantum metrology and coherence},
author = {Laura Ares and Alfredo Luis},
journal= {arXiv preprint arXiv:2102.03223},
year = {2021}
}
Comments
9 pages