Deterministic phase measurements exhibiting super-sensitivity and super-resolution

Journal article (2018)

Authors

C. Schäfermeier Technical University of Denmark, QN/Groeblacher Lab - AS
Miroslav Ježek Palacky University
Lars S. Madsen University of Queensland, Technical University of Denmark
Tobias Gehring Technical University of Denmark
U.L. Andersen Technical University of Denmark
Research Group
QN/Groeblacher Lab (AS) (TU Delft)
Copyright: © 2018 C. Schäfermeier, Miroslav Ježek, Lars S. Madsen, Tobias Gehring, Ulrik L. Andersen
DOI
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https://doi.org/10.1364/OPTICA.5.000060
More Info
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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.

Files

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