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Q: Fachverband Quantenoptik und Photonik
Q 2: Quanteninformation (Atome und Ionen I)
Q 2.3: Talk
Monday, March 10, 2008, 14:45–15:00, 1B
Towards fault-tolerant quantum computing with trapped ions — •Jan Benhelm1,2, Gerhard Kirchmair1,2, Christian F. Roos1,2, and Rainer Blatt1,2 — 1Institut für Experimentalphysik, Innsbruck — 2Institut für Quantenoptik und Quanteninformation, Österreichische Akademie der Wissenschaften, Innsbruck
For fault-tolerant computation, it is commonly believed that error thresholds ranging between 10−4 and 10−2 will be required depending on the noise model and the computational overhead for realizing the quantum gates. Up to now, all experimental implementations have fallen short of these requirements.
Here, we report on the experimental realization of a Mølmer-Sørensen type entangling gate operation with a fidelity of 99.3% which together with single-qubit operations forms a universal set of quantum gates. The gate operation is performed on a pair of qubits encoded in two trapped calcium ions using a single amplitude-modulated laser beam interacting with both ions at the same time. A robust gate operation, mapping separable states onto maximally entangled states, is achieved by adiabatically switching on and off the laser-ion coupling. We analyse the performance of a single gate and concatenations of up to 21 gate operations.