Entanglement-enhanced measurement of a completely unknown optical phase

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Title Entanglement-enhanced measurement of a completely unknown optical phase
Author Xiang, Guo-Yong; Higgins, Brendon Lloyd; Berry, D. W.; Wiseman, Howard Mark; Pryde, Geoff
Journal Name Nature Photonics
Year Published 2011
Place of publication United Kingdom
Publisher Nature Publishing Group
Abstract Precise interferometric measurement is vital to many scientific and technological applications. Using quantum entanglement allows interferometric sensitivity that surpasses the shot-noise limit (SNL)1, 2. To date, experiments demonstrating entanglement-enhanced sub-SNL interferometry3, 4, 5, 6, and most theoretical treatments7, 8, 9, 10, 11, 12, 13, have addressed the goal of increasing signal-to-noise ratios. This is suitable for phase-sensing—detecting small variations about an already known phase. However, it is not sufficient for ab initio phase-estimation—making a self-contained determination of a phase that is initially completely unknown within the interval [0, 2π). Both tasks are important2, but not equivalent. To move from the sensing regime to the ab initio estimation regime requires a non-trivial phase-estimation algorithm14, 15, 16, 17. Here, we implement a ‘bottom-up’ approach, optimally utilizing the available entangled photon states, obtained by post-selection5, 6. This enables us to demonstrate sub-SNL ab initio estimation of an unknown phase by entanglement-enhanced optical interferometry.
Peer Reviewed Yes
Published Yes
Alternative URI http://dx.doi.org/10.1038/nphoton.2010.268
Copyright Statement Copyright 2010 Nature Publishing Group. This is the author-manuscript version of this paper. Reproduced in accordance with the copyright policy of the publisher. Please refer to the journal website for access to the definitive, published version.
Volume 5
Issue Number 1
Page from 43
Page to 47
ISSN 1749-4885
Date Accessioned 2011-01-06
Language en_US
Research Centre Centre for Quantum Dynamics
Faculty Faculty of Science, Environment, Engineering and Technology
Subject Optical Physics
URI http://hdl.handle.net/10072/37530
Publication Type Journal Articles (Refereed Article)
Publication Type Code c1

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