Deterministic phase measurements exhibiting super-sensitivity and super-resolution

Clemens Schäfermeier*, Miroslav Ježek, Lars S. Madsen, Tobias Gehring, Ulrik Lund Andersen

*Corresponding author for this work

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Abstract

Phase super-sensitivity is obtained when the sensitivity in a phase measurement goes beyond the quantum shot noise limit, whereas super-resolution is obtained when the interference fringes in an interferometer are narrower than half the input wavelength. Here we show experimentally that these two features can be simultaneously achieved using a relatively simple setup based on Gaussian states and homodyne measurement. Using 430 photons shared between a coherent and a squeezed vacuum state, we demonstrate a 22-fold improvement in the phase resolution, while we observe a 1.7-fold improvement in the sensitivity. In contrast to previous demonstrations of super-resolution and super-sensitivity, this approach is fully deterministic.
Original languageEnglish
JournalOptica
Volume5
Issue number1
Pages (from-to)60-64
ISSN2334-2536
DOIs
Publication statusPublished - 2018

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