Deterministic phase measurements exhibiting super-sensitivity and super-resolution

Journal article (2018)

Authors

C. Schäfermeier Technical University of Denmark (DTU), QN/Groeblacher Lab -

Miroslav Ježek Palacky University

Lars S. Madsen Technical University of Denmark (DTU), University of Queensland

Tobias Gehring Technical University of Denmark (DTU)

U.L. Andersen Technical University of Denmark (DTU)

Research Group

QN/Groeblacher Lab () (TU Delft)

DOI: https://doi.org/10.1364/OPTICA.5.000060

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http://resolver.tudelft.nl/uuid:4e18bdc7-ee79-477c-8d49-3b9bc0ca2e10

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Published Date

20-01-2018

Language

English

Reuse Rights

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Faculty

Applied Sciences

Department

QN/Quantum Nanoscience

Research Group

QN/Groeblacher Lab

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.

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