Towards a transportable aluminium ion quantum logic optical clock

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Hannig, S.; Pelzer, L.; Scharnhorst, N.; Kramer, J.; Stepanova, M. et al: Towards a transportable aluminium ion quantum logic optical clock. In: Review of Scientific Instruments 90 (2019), Nr. 5, 053204. DOI: https://doi.org/10.1063/1.5090583

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With the advent of optical clocks featuring fractional frequency uncertainties on the order of 10-17 and below, new applications such as chronometric leveling with few-centimeter height resolution emerge. We are developing a transportable optical clock based on a single trapped aluminum ion, which is interrogated via quantum logic spectroscopy. We employ singly charged calcium as the logic ion for sympathetic cooling, state preparation, and readout. Here, we present a simple and compact physics and laser package for manipulation of 40Ca+. Important features are a segmented multilayer trap with separate loading and probing zones, a compact titanium vacuum chamber, a near-diffraction-limited imaging system with high numerical aperture based on a single biaspheric lens, and an all-in-fiber 40Ca+ repump laser system. We present preliminary estimates of the trap-induced frequency shifts on 27Al+, derived from measurements with a single calcium ion. The micromotion-induced second-order Doppler shift for 27Al+ has been determined to be δνEMMν=-0.4-0.3 +0.4×10-18 and the black-body radiation shift is δνBBR/ν = (-4.0 ± 0.4) × 10-18. Moreover, heating rates of 30 (7) quanta per second at trap frequencies of ωrad,Ca+ ≈ 2π × 2.5 MHz (ωax,Ca+ ≈ 2π × 1.5 MHz) in radial (axial) direction have been measured, enabling interrogation times of a few hundreds of milliseconds.
License of this version: CC BY 4.0 Unported
Document Type: Article
Publishing status: publishedVersion
Issue Date: 2019
Appears in Collections:Fakultät für Mathematik und Physik

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pos. country downloads
total perc.
1 image of flag of Germany Germany 34 32.69%
2 image of flag of United States United States 11 10.58%
3 image of flag of China China 8 7.69%
4 image of flag of Russian Federation Russian Federation 6 5.77%
5 image of flag of Czech Republic Czech Republic 6 5.77%
6 image of flag of Canada Canada 6 5.77%
7 image of flag of No geo information available No geo information available 5 4.81%
8 image of flag of Netherlands Netherlands 5 4.81%
9 image of flag of United Kingdom United Kingdom 4 3.85%
10 image of flag of Indonesia Indonesia 2 1.92%
    other countries 17 16.35%

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