Maximizing Information on the Environment by Dynamically Controlled Qubit Probes
At a Glance
Section titled āAt a Glanceā| Metadata | Details |
|---|---|
| Publication Date | 2016-01-25 |
| Journal | Physical Review Applied |
| Authors | Analia Zwick, Gonzalo A. Ćlvarez, Gershon Kurizki, Gonzalo A. Ćlvarez |
| Institutions | Weizmann Institute of Science |
| Citations | 66 |
Abstract
Section titled āAbstractāWe explore the ability of a qubit probe to characterize unknown parameters of its environment. By resorting to quantum estimation theory, we analytically find the ultimate bound on the precision of estimating key parameters of a broad class of ubiquitous environmental noises (ābathsā) which the qubit may probe. These include the probe-bath coupling strength, the correlation time of generic bath spectra, the power laws governing these spectra, as well as their dephasing times T2. Our central result is that by optimizing the dynamical control on the probe under realistic constraints one may attain the maximal accuracy bound on the estimation of these parameters by the least number of measurements possible. Applications of this protocol that combines dynamical control and estimation theory tools to quantum sensing are illustrated for a nitrogen-vacancy center in diamond used as a probe.