Precision Quantum Metrology and Nonclassicality in Linear and Nonlinear Detection Schemes
́Angel Rivas, Alfredo Luis · Physical Review Letters · 2010
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.