Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: 3D Sisyphus Cooling of Trapped Ions   Using a laser polarization gradient, we realize 3D Sisyphus cooling of
$^{171}$Yb$^+$ ions confined in and near the Lamb-Dicke regime in a linear Paul
trap. The cooling rate and final mean motional energy of a single ion are
characterized as a function of laser intensity and compared to semiclassical
and quantum simulations. Sisyphus cooling is also applied to a linear string of
four ions to obtain a mean energy of 1-3 quanta for all vibrational modes, an
approximately order-of-magnitude reduction below Doppler cooled energies. This
is used to enable subsequent, efficient sideband laser cooling.

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The categories of this paper are: cs
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The categories of this paper are: ao-sci
34
The categories of this paper are: chem-ph
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The categories of this paper are: math
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The categories of this paper are: adap-org
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The categories of this paper are: hep-th
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The categories of this paper are: econ
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The categories of this paper are: eess
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The categories of this paper are: funct-an
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The categories of this paper are: patt-sol
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The categories of this paper are: chao-dyn
10
The categories of this paper are: q-bio
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The categories of this paper are: nlin
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The categories of this paper are: solv-int
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The categories of this paper are: hep-lat
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The categories of this paper are: bayes-an