Precision spectroscopy by photon-recoil signal amplification

Yong Wan, Florian Gebert, Jannes B Wübbena, Nils Scharnhorst, Sana Amairi, Ian D Leroux, Börge Hemmerling, Niels Lörch, Klemens Hammerer and Piet O Schmidt ()
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Yong Wan: QUEST Institut, Physikalisch-Technische Bundesanstalt
Florian Gebert: QUEST Institut, Physikalisch-Technische Bundesanstalt
Jannes B Wübbena: QUEST Institut, Physikalisch-Technische Bundesanstalt
Nils Scharnhorst: QUEST Institut, Physikalisch-Technische Bundesanstalt
Sana Amairi: QUEST Institut, Physikalisch-Technische Bundesanstalt
Ian D Leroux: QUEST Institut, Physikalisch-Technische Bundesanstalt
Börge Hemmerling: QUEST Institut, Physikalisch-Technische Bundesanstalt
Niels Lörch: Institut für Theoretische Physik und Institut für Gravitationsphysik (Albert Einstein Institut), Leibniz Universität Hannover
Klemens Hammerer: Institut für Theoretische Physik und Institut für Gravitationsphysik (Albert Einstein Institut), Leibniz Universität Hannover
Piet O Schmidt: QUEST Institut, Physikalisch-Technische Bundesanstalt

Nature Communications, 2014, vol. 5, issue 1, 1-6

Abstract: Abstract Precision spectroscopy of atomic and molecular ions offers a window to new physics, but is typically limited to species with a cycling transition for laser cooling and detection. Quantum logic spectroscopy has overcome this limitation for species with long-lived excited states. Here we extend quantum logic spectroscopy to fast, dipole-allowed transitions and apply it to perform an absolute frequency measurement. We detect the absorption of photons by the spectroscopically investigated ion through the photon recoil imparted on a co-trapped ion of a different species, on which we can perform efficient quantum logic detection techniques. This amplifies the recoil signal from a few absorbed photons to thousands of fluorescence photons. We resolve the line centre of a dipole-allowed transition in 40Ca+ to 1/300 of its observed linewidth, rendering this measurement one of the most accurate of a broad transition. The simplicity and versatility of this approach enables spectroscopy of many previously inaccessible species.

Date: 2014
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DOI: 10.1038/ncomms4096

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