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Q: Fachverband Quantenoptik und Photonik
Q 2: Quanteninformation (Atome und Ionen I)
Q 2.2: Vortrag
Montag, 10. März 2008, 14:30–14:45, 1B
Ion trap quantum gates with amplitude-modulated laser beams — •Christian Roos — Institut für Quantenoptik und Quanteninformation, Österreichische Akademie der Wissenschaften, Otto-Hittmair-Platz 1, 6020 Innsbruck, Österreich
In ion traps, entangling gate operations can be realized by a bichromatic pair of laser beams that collectively interact with the ions. A new method of modelling the laser-ion interaction is introduced that turns out to be superior to standard techniques for the description of gate operations on optical qubits. The treatment allows for a comparison of the performance of gates based on σz⊗σz and σφ⊗σφ interactions on optical transitions where the bichromatic laser field can be realized by an amplitude-modulated laser resonant with the qubit transition [1]. Shaping the amplitude of the bichromatic laser pulse is shown to make the gates more robust against experimental imperfections. An experimental implementation of the gate using a pair of calcium ions have shown very promising results [2].
[1] C. F. Roos, arXiv:0710.1204, accepted for publication in New. J. Phys.
[2] J. Benhelm, G. Kirchmair, C. F. Roos, R. Blatt, manuscript in preparation.