Frankfurt 2006 – scientific programme
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SYQT: Quantum Computing with Trapped Electrons
SYQT 1: Quantum Computing with Trapped Electrons
SYQT 1.3: Invited Talk
Monday, March 13, 2006, 11:40–12:00, HV
Coupling trapped ions via transmission lines for quantum computing — •Hartmut Häffner1,2, Tony Lee1,2, and Rainer Blatt1,2 — 1Institut für Quantenoptik und Quanteninformation Österreichische Akademie der Wissenschaften, Innsbruck, Austria — 2Institut für Experimentalphysik, Innsbruck, Austria
An oscillating trapped ion induces oscillating image charges in the trap electrodes. If this current is sent to the electrodes of a second trap, it influences the motion of an ion in the second trap. 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 sources of decoherence are heating (e.g. Johnson–noise) and dephasing of the electronic wave–function inside the transmission line connecting the traps. Using superconducting transmission lines a coherent current transport over macroscopic distances (>1 mm) is possible. In addition, Johnson–noise heating would be greatly reduced, and the coherent coupling of two ions becomes feasible. The expected time for a complete exchange of the ion motions is 1 ms for a trap with a characteristic size of 50 µm.