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Q: Fachverband Quantenoptik und Photonik
Q 2: Quanteninformation (Atome und Ionen I)
Q 2.6: Talk
Monday, March 10, 2008, 15:30–15:45, 1B
Coupling trapped ions via transmission lines — Rob Clark1,2, Sankaranarayanan S1, •Nikos Daniidilis1, and Hartmut Häffner1 — 1Institut für Quantenoptik und Quanteninformation, Österreichische Akademie der Wissenschaften, Innsbruck, Österreich — 2Center for Ultracold Atoms, Massachusetts Institute of Technology, START project Cambridge, MA, USA
An oscillating trapped ion induces oscillating image charges in the trap electrodes. If this current is send to the electrodes of a second trap, it influences the motion of an ion in the second trap. The expected time for a complete exchange of the ion motions is 1 ms for a trap with a characteristic size of 50 µm. This inter–trap coupling may be used for scalable quantum computing, cooling ion species that are not directly accessible to laser cooling, for the non-invasive study of superconductors, and for coupling an ion–trap quantum computer to a solid–state quantum computer, e.g. a system of Josephson junctions.
We will discuss the feasibility of experiments towards these goals with trapped Calcium ions. The most relevant source of decoherence is heating of the ion motion due to noise in the trap electrodes (e.g. Johnson–noise). By operating ion traps at cryogenic temperatures, heating will be greatly reduced, allowing the coherent coupling of two ions. In this context, we will present results from currently operating planar traps, as well as efforts in developing microfabricated planar traps. In particular, we will discuss the influence of an electrically floating coupling electrode on trap performance.