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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.
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| http://dx.doi.org/10.1103/PhysRevLett.105.010403 | DOI Listing |
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