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A tight Cram?r?Rao bound for joint parameter estimation with a pure two-mode squeezed probe

Bradshaw, Mark; Assad, Syed; Lam, Ping


We calculate the Holevo Cramér–Rao bound for estimation of the displacement experienced by one mode of an two-mode squeezed vacuum state with squeezing r and find that it is equal to . This equals the sum of the mean squared error obtained from a dual homodyne measurement, indicating that the bound is tight and that the dual homodyne measurement is optimal.

CollectionsANU Research Publications
Date published: 2017
Type: Journal article
Source: Physics Letters A
DOI: 10.1016/j.physleta.2017.06.024


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