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Q: Fachverband Quantenoptik und Photonik
Q 32: Quantum information: Atoms and ions III
Q 32.3: Vortrag
Dienstag, 19. März 2013, 14:45–15:00, A 310
Laser Quantum Control of 9Be+ Using an Optical Frequency Comb — •Anna-Greta Paschke1, Malte Niemann1, Timko Dubielzig1, Martina Carsjens1,2, Matthias Kohnen2,1, and Christian Ospelkaus1,2 — 1Institut für Quantenoptik, Leibniz Universität Hannover — 2PTB Braunschweig
A CPT symmetry test experiment based on a g-factor comparison between single trapped (anti-)protons is currently being designed in our group. We aim to overcome the main experimental challenge, single-shot state readout for single (anti-)protons, by transferring their spin states to a co-trapped “logic” 9Be+ ion for readout using quantum logic operations [Heinzen and Wineland, PRA 42, 2977 (1990)].
At low magnetic fields, the required quantum logic operations on 9Be+ are typically carried out using stimulated Raman two-photon transitions driven by pairs of phase-coherent CW laser fields. Their detuning is near-resonant with the qubit splitting of typically only a few GHz. Our experiment requires a rather high magnetic field (>1 T). The resulting qubit splitting easily exceeds 28 GHz and renders the CW approach unattractive. We explore optical frequency combs [Hayes et al., PRL 104, 140501 (2010)] for driving stimulated Raman transitions in 9Be+. Here, a considerable experimental challenge arises from the small excited state fine structure splitting of ≈ 200 GHz, which requires a careful design of the comb’s spectral properties. We discuss stimulated Rabi rates, spontaneous scattering rates, spectral compression and spectral pulse shaping in order to obtain an optimized spectrum.