Hannover 2013 – wissenschaftliches Programm
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Q: Fachverband Quantenoptik und Photonik
Q 24: Quantum information: Atoms and ions II
Q 24.1: Gruppenbericht
Dienstag, 19. März 2013, 11:00–11:30, A 310
Trajectory-Based Micro-Motion Compensation and Simulation of Long Distance Entanglement in a Segmented Trap — •M. Johanning1, M. T. Baig1, T. Collath1, T. F. Gloger1, D. Kaufmann1, P. Kaufmann1, M. Giampaolo2, S. Zipilli2, F. Illuminati2, and Ch. Wunderlich1 — 1Faculty of Science and Technology, Dep. of Physics, University of Siegen, Walter Flex Str. 3, 57072 Siegen, Germany — 2Dep. of Mathematics and Informatics, University of Salerno, 84084 Fisciano SA, Italia
We report on the minimization of micromotion in a segmented linear paul trap by analyzing equilibrium position trajectories under dc and rf variations. We discuss the modelling and analysis of such trajectories and introduce methods to speed up the local optimization process down to a few seconds. We give an estimate for the accuracy of the optimization procedure and compare to other methods.
Furthermore, we propose an experiment to demonstrate the presence of long distance entanglement (LDE) in such a trap. LDE refers to the occurrence of ground-state entanglement between the end spins of a spin chain, and can be used to implement a quantum bus [1]. By designing the axial trapping potential, the required relative coupling strengths can be realized; suitable XY interactions can be obtained using a sequence of microwave pulses. We discuss how to combine this with previous findings for the adiabatic preparation of the ground state of an XY spin chain which exhibits LDE, and we demonstrate numerically its feasibility with realistic parameters.
[1] S. M. Giampaolo, F. Illuminati, New J. Phys. 12, 025019 (2010)