Optimal quantum estimation of the coupling between two bosonic modes
G. Mauro D'Ariano, Matteo G. A. Paris, Paolo Perinotti
Abstract
We address the problem of the optimal quantum estimation of the coupling parameter of a bilinear interaction, such as the transmittivity of a beam splitter or the internal phase-shift of an interferometer. The optimal measurement scheme exhibits Heisenberg scaling of the measurement precision versus the total energy.
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