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  Motional Fock states for quantum-enhanced amplitude and phase measurements with trapped ions

Wolf, F., Shi, C., Heip, J. C., Gessner, M., Pezzè, L., Smerzi, A., et al. (2019). Motional Fock states for quantum-enhanced amplitude and phase measurements with trapped ions. Nature Communications, 10: 2929. doi:10.1038/s41467-019-10576-4.

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Item Permalink: http://hdl.handle.net/21.11116/0000-0004-480C-F Version Permalink: http://hdl.handle.net/21.11116/0000-0004-4810-9
Genre: Journal Article

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 Creators:
Wolf, Fabian, Author
Shi, Chunyan, Author
Heip, Jan C., Author
Gessner, Manuel, Author
Pezzè, Luca, Author
Smerzi, Augusto, Author
Schulte, Marius, Author
Hammerer, K.1, Author              
Schmidt, Piet O., Author
Affiliations:
1Laser Interferometry & Gravitational Wave Astronomy, AEI-Hannover, MPI for Gravitational Physics, Max Planck Society, ou_24010              

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Free keywords: Physics, Atomic Physics, physics.atom-ph,Quantum Physics, quant-ph
 Abstract: Non-vanishing fluctuations of the vacuum state are a salient feature of quantum theory. These fluctuations fundamentally limit the precision of quantum sensors. Nowadays, several systems such as optical clocks, gravitational wave detectors, matter-wave interferometers, magnetometers, and optomechanical systems approach measurement sensitivities where the effect of quantum fluctuations sets a fundamental limit, the so-called standard quantum limit (SQL). It has been proposed that the SQL can be overcome by squeezing the vacuum fluctuations. Realizations of this scheme have been demonstrated in various systems. However, protocols based on squeezed vacuum crucially rely on precise control of the relative orientation of the squeezing with respect to the operation imprinting the measured quantity. Lack of control can lead to an amplification of noise and reduces the sensitivity of the device. Here, we experimentally demonstrate a novel quantum metrological paradigm based on phase insensitive Fock states of the motional state of a trapped ion, with applications in frequency metrology and displacement detection. The measurement apparatus is used in two different experimental settings probing non-commuting observables with sensitivities beyond the SQL. In both measurements, classical preparation and detection noise are sufficiently small to preserve the quantum gain in a full metrological protocol.

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 Dates: 2018-07-052019
 Publication Status: Published in print
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 Rev. Method: -
 Identifiers: arXiv: 1807.01875
URI: http://arxiv.org/abs/1807.01875
DOI: 10.1038/s41467-019-10576-4
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Title: Nature Communications
Source Genre: Journal
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Pages: - Volume / Issue: 10 Sequence Number: 2929 Start / End Page: - Identifier: -