Berlin 2014 – scientific programme

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Q: Fachverband Quantenoptik und Photonik

Q 21: Quantum information: Atoms and ions III

Q 21.4: Talk

Tuesday, March 18, 2014, 11:15–11:30, UDL HS3038

Transport of ions prepared in superpositions of hyperfine states — •Michael Johanning, M. Tanveer Baig, Thomas Collath, Timm F. Gloger, Delia Kaufmann, Peter Kaufmann, and Christof Wunderlich — Faculty of Science and Technology, Department of Physics, University of Siegen, Walter Flex Str. 3, 57072 Siegen, Germany

We analyze the coherence of hyperfine states during adiabatic shuttling of Yb-ions and discuss the calculation of proper shuttling potentials based on electric field simulations in our trap. Shuttling is carried out with a success rate indistinguishable from unity and this figure of merit is limited by ions becoming dark. The coherence of superpositions of hyperfine states is experimentally characterized by bracketing a variable number of shuttling attempts by π/2-pulses effectively forming a Ramsey sequence with a fixed free precession time. The results are analysed in terms of a reduction of Ramsey fringe contrast: we observe a state infidelity of about 1 % per shuttling when shuttling over a distance of 100 µm and discuss strategies to further improve on this result.