Entanglement-enhanced measurement of a completely unknown optical phase

G. Y. Xiang, B. L. Higgins, D. W. Berry, H. M. Wiseman, G. J. Pryde

Research output: Contribution to journalArticleResearchpeer-review

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). To date, experiments demonstrating entanglement-enhanced sub-SNL interferometry, and most theoretical treatments, 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 important, but not equivalent. To move from the sensing regime to the ab initio estimation regime requires a non-trivial phase-estimation algorithm. Here, we implement a 'bottom-up' approach, optimally utilizing the available entangled photon states, obtained by post-selection. This enables us to demonstrate sub-SNL ab initio estimation of an unknown phase by entanglement-enhanced optical interferometry.

LanguageEnglish
Pages43-47
Number of pages5
JournalNature Photonics
Volume5
Issue number1
DOIs
Publication statusPublished - Jan 2011
Externally publishedYes

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shot noise
Shot noise
interferometry
Interferometry
Quantum entanglement
signal to noise ratios
intervals
Signal to noise ratio
Photons
sensitivity
photons
Experiments

Cite this

Xiang, G. Y. ; Higgins, B. L. ; Berry, D. W. ; Wiseman, H. M. ; Pryde, G. J. / Entanglement-enhanced measurement of a completely unknown optical phase. In: Nature Photonics. 2011 ; Vol. 5, No. 1. pp. 43-47.
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Entanglement-enhanced measurement of a completely unknown optical phase. / Xiang, G. Y.; Higgins, B. L.; Berry, D. W.; Wiseman, H. M.; Pryde, G. J.

In: Nature Photonics, Vol. 5, No. 1, 01.2011, p. 43-47.

Research output: Contribution to journalArticleResearchpeer-review

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