Precision Quantum Metrology and Nonclassicality in Linear and Nonlinear Detection Schemes

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Date: 
2010-06-30
Author(s): 

Ángel Rivas and Alfredo Luis

Reference: 

Phys. Rev. Lett. 105, 010403 (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.