Precision spectroscopy by photon-recoil signal amplification.
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 (40)Ca(+) 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.
1] QUEST Institut, Physikalisch-Technische Bundesanstalt, 38116 Braunschweig, Germany [2].
Yong
Y
Wan
1] QUEST Institut, Physikalisch-Technische Bundesanstalt, 38116 Braunschweig, Germany [2].
Florian
F
Gebert
QUEST Institut, Physikalisch-Technische Bundesanstalt, 38116 Braunschweig, Germany.
Jannes B
JB
Wübbena
QUEST Institut, Physikalisch-Technische Bundesanstalt, 38116 Braunschweig, Germany.
Nils
N
Scharnhorst
QUEST Institut, Physikalisch-Technische Bundesanstalt, 38116 Braunschweig, Germany.
Sana
S
Amairi
QUEST Institut, Physikalisch-Technische Bundesanstalt, 38116 Braunschweig, Germany.
Ian D
ID
Leroux
1] QUEST Institut, Physikalisch-Technische Bundesanstalt, 38116 Braunschweig, Germany [2].
Börge
B
Hemmerling
Institut für Theoretische Physik und Institut für Gravitationsphysik (Albert Einstein Institut), Leibniz Universität Hannover, 30167 Hannover, Germany.
Niels
N
Lörch
Institut für Theoretische Physik und Institut für Gravitationsphysik (Albert Einstein Institut), Leibniz Universität Hannover, 30167 Hannover, Germany.
Klemens
K
Hammerer
1] QUEST Institut, Physikalisch-Technische Bundesanstalt, 38116 Braunschweig, Germany [2] Institut für Quantenoptik, Leibniz Universität Hannover, 30167 Hannover, Germany.
Piet O
PO
Schmidt