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33544464442
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note
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For long interrogation times, sideband cooling on the logic ion can be applied during and/or after interrogation of the spectroscopy transition (before the first coherent transfer step, Fig. 1C), thus eliminating a degradation of linewidth and contrast caused by transfer mode heating during interrogation.
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20
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33544465797
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note
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Methods are available as supporting materials on Science Online.
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33544460241
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note
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We did not prepare the ion in any particular state before each experiment. Rather, competition between state preparation and off-resonant depumping determined the distribution of polarizations before the next repetition of the experiment.
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23
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0037127625
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33544457611
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in preparation
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M. Herrmann et al., in preparation.
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Herrmann, M.1
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33544459316
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note
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We thank S. Diddams, J. Koelemeij, and J. Ye for stimulating discussions and comments on the manuscript This work was supported by the Office of Naval Research, the Advanced Research and Development Activity/National Security Agency, and the National Institute of Standards and Technology (NIST). P.O.S. acknowledges support from the Alexander von Humboldt Foundation. This work is a contribution of NIST, not subject to U.S. copyright.
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