Improvement of an Atomic Clock using Squeezed Vacuum

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Kruse, I.; Lange, K.; Peise, J.; Luecke, B.; Klempt, C.; et al: Improvement of an Atomic Clock using Squeezed Vacuum. In: Physical Review Letters 117 (2016), Nr. 14, 143004. DOI: https://doi.org/10.1103/PhysRevLett.117.143004

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Sum total of downloads: 129




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Abstract: 
Since the pioneering work of Ramsey, atom interferometers are employed for precision metrology, in particular to measure time and to realize the second. In a classical interferometer, an ensemble of atoms is prepared in one of the two input states, whereas the second one is left empty. In this case, the vacuum noise restricts the precision of the interferometer to the standard quantum limit (SQL). Here, we propose and experimentally demonstrate a novel clock configuration that surpasses the SQL by squeezing the vacuum in the empty input state. We create a squeezed vacuum state containing an average of 0.75 atoms to improve the clock sensitivity of 10000 atoms by 2.05(-0:37)(+0.34) dB. The SQL poses a significant limitation for today's microwave fountain clocks, which serve as the main time reference. We evaluate the major technical limitations and challenges for devising a next generation of fountain clocks based on atomic squeezed vacuum.
License of this version: Es gilt deutsches Urheberrecht. Das Dokument darf zum eigenen Gebrauch kostenfrei genutzt, aber nicht im Internet bereitgestellt oder an Außenstehende weitergegeben werden.
Document Type: article
Publishing status: publishedVersion
Issue Date: 2016
Appears in Collections:Fakultät für Mathematik und Physik

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pos. country downloads
total perc.
1 image of flag of Germany Germany 75 58.14%
2 image of flag of United States United States 12 9.30%
3 image of flag of China China 12 9.30%
4 image of flag of Netherlands Netherlands 7 5.43%
5 image of flag of Japan Japan 3 2.33%
6 image of flag of Iran, Islamic Republic of Iran, Islamic Republic of 3 2.33%
7 image of flag of United Kingdom United Kingdom 3 2.33%
8 image of flag of France France 3 2.33%
9 image of flag of Singapore Singapore 2 1.55%
10 image of flag of India India 2 1.55%
    other countries 7 5.43%

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