Środowiskowe Seminarium z Informacji i Technologii Kwantowych

Quantum systems may be investigated from the perspective of the resource they represent in quantum metrology applications. This resource is quantified by the so-called quantum Fisher information (QFI). In this work, we introduce a mathematical technique to quantify the minimal QFI in a given metrology scenario, compatible with some given measured mean values. We show that some popular experiments on spin ensembles allow one to prepare very useful states for metrology, beyond what was previously envisioned.

Reference: Quantum 7, 1152 (2023)