Berlin 2005 – wissenschaftliches Programm
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Q: Quantenoptik und Photonik
Q 73: Quantencomputer
Q 73.6: Vortrag
Mittwoch, 9. März 2005, 15:15–15:30, HU 2002
Coherent control of trapped ions using off-resonant lasers — •Juan Jose Garcia Ripoll1, Peter Zoller2,3, and Juan I. Cirac1 — 1Max-Planck-Institut für Quantenoptik, Hans-Kopfermann-Str. 1, Garching bei München, D-85748 — 2Institute for Theoretical Physics, University of Innsbruck, A-6020 Innsbruck, Austria — 3Institute for Quantum Optics and Quantum Information of the Austrian Academy of Sciences, A-6020 Innsbruck, Austria
In this work we develop a unified framework to study the coherent control of trapped ions subject to state-dependent forces. Taking different limits in our theory, we can reproduce two different designs of a two-qubit quantum gate —the pushing gate [1] and the fast gates based on laser pulses from [2]—, and propose a new design based on continuous laser beams. We demonstrate how to simulate Ising Hamiltonians in a many ions setup, and how to create highly entangled states and induce squeezing. Finally, in a detailed analysis we identify the physical limits of this technique and study the dependence of errors on the temperature.
[1] J. I. Cirac and P. Zoller, Nature 404, 579-581 (2000).
[2] J. J. Garcia-Ripoll, P. Zoller and J. I. Cirac, Phys. Rev. Lett. 91, 157901 (2003).