Deterministic phase measurements exhibiting super-sensitivity and super-resolution
C. Schäfermeier (TU Delft - QN/Groeblacher Lab, Technical University of Denmark (DTU))
Miroslav Ježek (Palacky University)
Lars S. Madsen (Technical University of Denmark (DTU), University of Queensland)
Tobias Gehring (Technical University of Denmark (DTU))
Ulrik L. Andersen (Technical University of Denmark (DTU))
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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.