Invertible condition of quantum Fisher information matrix for a mixed qubit
arXiv:1601.05866 · doi:10.1140/epjd/e2015-60460-5
Abstract
Estimating multiparamter simultaneously as precise as possible is an important goal of quantum metrolo- gy. As a first step to this end, here we give a condition determining whether two arbitrary parameters can be estimated simultaneously for a qubit in the mixed state. An application of this condition is shown.
The European Physical Journal D 2016