Precision Quantum Metrology and Nonclassicality in Linear and Nonlinear Detection Schemes

Ángel Rivas, Alfredo Luis
2010 Physical Review Letters  
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.
doi:10.1103/physrevlett.105.010403 pmid:20867426 fatcat:pi4coyitqngwnjmevwpkqbmale