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Q: Fachverband Quantenoptik und Photonik
Q 30: Poster II
Q 30.50: Poster
Dienstag, 3. März 2009, 16:30–19:00, VMP 9 Poster
Raman spectroscopy of a single ion coupled to a high-finesse optical cavity — •Andreas Stute1,2, Helena G. Barros1,2, Tracy Northup1, Carlos Russo1, Piet O. Schmidt1, and Rainer Blatt1,2 — 1Institut für Experimentalphysik, Universität Innsbruck, Technikerstr. 25, A-6020 Innsbruck — 2Institut für Quantenoptik und Quanteninformation, Österreichische Akademie der Wissenschaften, Otto-Hittmair-Platz 1, A-6020 Innsbruck
We describe an ion-based cavity-QED system consisting of a single trapped 40Ca+ ion coupled to the mode of a high-finesse optical resonator. Intra-cavity photons are generated in a vacuum-stimulated Raman process between two atomic states driven by a laser and the cavity vacuum field. We observe Raman spectra for different excitation polarizations and find quantitative agreement with theoretical simulations. We can resolve motional sidebands in the Raman spectrum due to the residual motion of the Doppler-cooled ion, which also leads to ion delocalization with respect to the standing wave of the catvity mode. The detection of the photons leaving the cavity through one of the mirrors in a Hanbury Brown and Twiss setup allows the measurement of light intensity and its correlations g(2)(τ). For a pulsed excitation the g(2)(τ) reveals the signature of a single photon source, whereas for continuous excitation we can tune the photon statistics from sub-Poissonian to super-Poissonian statistics. This system offers prospects for cavity-assisted resolved-sideband ground-state cooling and coherent manipulation of ions and photons.