RSS icon
Twitter icon
Facebook icon
Vimeo icon
YouTube icon

Optimal phase measurements with bright- and vacuum-seeded SU(1,1) interferometers

TitleOptimal phase measurements with bright- and vacuum-seeded SU(1,1) interferometers
Publication TypeJournal Article
Year of Publication2017
AuthorsB. E. Anderson, B. L. Schmittberger, P. Gupta, K. M. Jones, and P. D. Lett
JournalPHYSICAL REVIEW A
Volume95
Pagination063843
Date PublishedJUN 27
Type of ArticleArticle
ISSN2469-9926
Abstract

The SU(1,1) interferometer can be thought of as a Mach-Zehnder interferometer with its linear beam splitters replaced with parametric nonlinear optical processes. We consider the cases of bright- and vacuum-seeded SU(1,1) interferometers using intensity or homodyne detectors. A simplified truncated scheme with only one nonlinear interaction is introduced, which not only beats conventional intensity detection with a bright seed, but can saturate the phase-sensitivity bound set by the quantum Fisher information. We also show that the truncated scheme achieves a sub-shot-noise phase sensitivity in the vacuum-seeded case, despite the phase-sensing optical beams having no well-defined phase.}, %%Address = {ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA

DOI10.1103/PhysRevA.95.063843