Dresden 2011 – wissenschaftliches Programm
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Q: Fachverband Quantenoptik und Photonik
Q 26: Quantum Information: Atoms and Ions 2
Q 26.9: Vortrag
Mittwoch, 16. März 2011, 12:45–13:00, HÜL 386
Optimal Controlled Phasegates for Trapped Neutral Atoms at the Quantum Speed Limit — •Michael Goerz1, Tommaso Calarco2, and Christiane P. Koch1,3 — 1Institut für Theoretische Physik, Freie Universität Berlin, Germany — 2Institut für Quanteninformationsverarbeitung, Universität Ulm, Germany — 3Institut für Physik, Universität Kassel, Germany
We study controlled phasegates for ultracold atoms in an optical lattice. A shaped laser pulse drives transitions between the ground and electronically excited states where the atoms are subject to a long-range 1/R3 interaction. We fully account for this interaction and use optimal control theory to calculate the pulses. This allows us to determine the minimum pulse duration, respectively, gate time T that is required to obtain high fidelity. We find the gate time to be limited either by the interaction strength in the excited state or by the ground state vibrational motion in the trap. The latter needs to be resolved in order to fully restore the motional state of the atoms at the end of the gate.