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  Ab-initio Quantum Enhanced Optical Phase Estimation Using Real-time Feedback Control

Berni, A. A., Gehring, T., Nielsen, B. M., Händchen, V., Paris, M. G. A., & Andersen, U. L. (2015). Ab-initio Quantum Enhanced Optical Phase Estimation Using Real-time Feedback Control. Nature Photonics, 9, 577-581. doi:10.1038/nphoton.2015.139.

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Item Permalink: http://hdl.handle.net/11858/00-001M-0000-0028-57FA-7 Version Permalink: http://hdl.handle.net/11858/00-001M-0000-0028-57FB-5
Genre: Journal Article

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1503.01365.pdf (Preprint), 835KB
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 Creators:
Berni, Adriano A., Author
Gehring, Tobias, Author
Nielsen, Bo M., Author
Händchen, Vitus1, Author              
Paris, Matteo G. A., Author
Andersen, Ulrik L., Author
Affiliations:
1Laser Interferometry & Gravitational Wave Astronomy, AEI-Hannover, MPI for Gravitational Physics, Max Planck Society, escidoc:24010              

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Free keywords: Quantum Physics, quant-ph
 Abstract: Optical phase estimation is a vital measurement primitive that is used to perform accurate measurements of various physical quantities like length, velocity and displacements. The precision of such measurements can be largely enhanced by the use of entangled or squeezed states of light as demonstrated in a variety of different optical systems. Most of these accounts however deal with the measurement of a very small shift of an already known phase, which is in stark contrast to ab-initio phase estimation where the initial phase is unknown. Here we report on the realization of a quantum enhanced and fully deterministic phase estimation protocol based on real-time feedback control. Using robust squeezed states of light combined with a real-time Bayesian estimation feedback algorithm, we demonstrate deterministic phase estimation with a precision beyond the quantum shot noise limit. The demonstrated protocol opens up new opportunities for quantum microscopy, quantum metrology and quantum information processing.

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 Dates: 2015-03-042015
 Publication Status: Published in print
 Pages: 5 figures
 Publishing info: -
 Table of Contents: -
 Rev. Method: -
 Identifiers: arXiv: 1503.01365
DOI: 10.1038/nphoton.2015.139
 Degree: -

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Title: Nature Photonics
Source Genre: Journal
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Pages: - Volume / Issue: 9 Sequence Number: - Start / End Page: 577 - 581 Identifier: ISSN: 1749-4885
CoNE: http://pubman.mpdl.mpg.de/cone/journals/resource/1000000000240270