Precision quantum metrology and nonclassicality in linear and nonlinear detection schemes.
We examine whether metrological resolution beyond coherent states is a nonclassical effect. We show that this is true for linear detection schemes but false for nonlinear schemes, and propose a very simple experimental setup to test it. We find a nonclassicality criterion derived from quantum Fisher information.
Rivas
Angel
A
Institut für Theoretische Physik, Universität Ulm, Ulm D-89069, Germany.
Luis
Alfredo
A