RT Journal Article
T1 Intrinsic metrological resolution as a distance measure and nonclassical light
A1 Rivas, Ángel
A1 Luis Aina, Alfredo
AB 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 Lambda fully symmetric on the probe rho 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.
PB American Physical Society
SN 1050-2947
YR 2008
FD 2008-06-10
LK https://hdl.handle.net/20.500.14352/51486
UL https://hdl.handle.net/20.500.14352/51486
LA eng
NO ©2008 The American Physical Society. A.R. acknowledges financial support from the University of Hertfordshire and the EU Integrated Project QAP. A.L. acknowledges support from the Universidad Complutense Project No. PR1-A/07-15378.
NO University of Hertfordshire
NO Unión Europea (UE)
NO Universidad Complutense de Madrid (UCM)
DS Docta Complutense
RD 12 abr 2025