Mainz 2017 – scientific programme
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Q: Fachverband Quantenoptik und Photonik
Q 18: Quantum Effects: Cavity QED I
Q 18.5: Talk
Tuesday, March 7, 2017, 12:00–12:15, P 4
Coupling a trapped ion to a fiber cavity — •Florian R. Ong1, Klemens Schüppert1, Pierre Jobez1, Dario A. Fioretto1, Konstantin Friebe1, Moonjoo Lee1, Markus Teller1, Florian Kranzl1, Konstantin Ott2, Sebastian Garcia2, Jakob Reichel2, Rainer Blatt1,3, and Tracy E. Northup1 — 1Universität Innsbruck, Institut für Experimentalphysik, Technikerstrasse 25, A-6020 Innsbruck, Austria — 2Laboratoire Kastler Brossel, ENS/UPMC-Paris 6/CNRS, F-75005 Paris, France — 3Institut für Quantenoptik und Quanteninformation der Österreichischen Akademie der Wissenschaften, A-6020 Innsbruck, Austria
A single atom coupled to an optical cavity can be used as a coherent quantum interface between stationary and flying qubits in a quantum network. Using fiber-based cavities, we expect to reach the strong coupling regime of cavity QED with a single trapped ion. Operating in this regime would enable protocols for quantum communication over long distances to be carried out with enhanced fidelity and efficiency. We will report on our current efforts to couple a calcium ion stored in a linear Paul trap to a fiber cavity. In our setup the cavity is formed between a photonic crystal fiber and a multimode fiber. Both fibers are mounted on separate nanopositioners, enabling us to tune the cavity length and optimize its alignment in vacuum. By developing procedures to control the charges trapped on the fibers’ dielectric surfaces, we were able to couple an ion to cavities with lengths of about 500 µm and with finesses in excess of 30,000.