2017/05/31 by Clemens Schäfermeier, Miroslav Ježek, Lars S. Madsen +2 · 1 citation
Physics and Astronomy · #quant-ph
paper · pdf · doi:10.1364/optica.5.000060
published as Optica, Vol. 5, Issue 1, pp. 60-64 (2018) · v2:Published Optica version with supplemental information
arxiv created 2018/01/25 · arxiv updated 2018/01/26
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.