3 years ago

Deterministic phase measurements exhibiting super-sensitivity and super-resolution.

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

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.

Publisher URL: http://arxiv.org/abs/1705.05609

DOI: arXiv:1705.05609v2

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