Neutron optical test of completeness of quantum root-mean-square errors

One of the major problems in quantum physics has been to generalize classical root-mean-square error measurements obtain an measure satisfying both soundness (to vanish for any accurate measurements) and completeness only measurements). A noise-operator based commonly used this purpose, but it turned out incomplete. Recently, Ozawa proposed a new definition be sound complete. Here, we present neutron optical demonstration projective (or sharp) as well generalized unsharp) measurements.