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A: Fachverband Atomphysik

A 20: Poster: Precision spectroscopy of atoms and ions (with Q)

A 20.3: Poster

Dienstag, 19. März 2013, 16:00–18:30, Empore Lichthof

Techniques for few photon spectroscopy of a trapped ion through sensitive recoil detection — •Florian Gebert¹, Yong Wan¹, Boerge Hemmerling², and Piet O. Schmidt¹ — ¹QUEST Inst. for Exp. Quantum Metrology, PTB Braunschweig and Leibniz Univ. of Hannover, Germany — ²Department of Physics, Harvard University, Cambridge, MA02138, USA

We present the theoretical and experimental basis for a highly-sensitive spectroscopy technique, based on the detection of motional excitation through photon recoil. In the experiment we trap an ion crystal consisting of two ions, the spectroscopy ion and the logic ion for cooling and detection. Spectroscopy is performed by first cooling the axial modes of the ion crystal to the motional ground state. Scattering of photons on the spectroscopy ion results in recoil kicks, which populate excited motional states. We present a theoretical model of the motional state evolution of this system.

The population of the motional mode can be detected through application of a red sideband pulse on the logic ion, which changes the internal state of the ion if the system is in an excited motional state. This detection techniques suffers from an incomplete transfer of population, since the Rabi frequency is a function of the initial motional state. We present theoretical and experimental results on the investigation of adiabatic passage techniques for state independent population transfer, which increases the signal to noise ratio of the spectroscopy signal.