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        Intrinsic metrological resolution as a distance measure and nonclassical light

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        903416.pdf (PDF, 178Kb)
        Author
        Rivas, A.
        Luis, A.
        Attention
        2299/3449
        Abstract
        We elaborate on a Hilbert-Schmidt distance measure assessing the intrinsic metrological accuracy in the detection of signals imprinted on quantum probe states by signal-dependent transformations. For small signals this leads to a probe-transformation measure Λ fully symmetric on the probe ρ and the generator G of the transformation Λ(ρ,G)=Λ(G,ρ). Although Λ can be regarded as a generalization of variance, we show that no uncertainty relation holds for the product of measures corresponding to complementary generators. We show that all states with resolution larger than coherent states are nonclassical. We apply this formalism to feasible probes and transformations.
        Publication date
        2008
        Published in
        Physical Review A
        Published version
        https://doi.org/10.1103/PhysRevA.77.063813
        Other links
        http://hdl.handle.net/2299/3449
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