Heidelberg 2015 – wissenschaftliches Programm

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Q: Fachverband Quantenoptik und Photonik

Q 25: Quantum Information: Quantum Computation II

Q 25.7: Vortrag

Dienstag, 24. März 2015, 16:00–16:15, C/HSO

Internal state fidelity during ion transport — Peter Kaufmann, Timm F. Gloger, Delia Kaufmann, M. Tanveer Baig, Thomas Collath, •Michael Johanning, and Christof Wunderlich — Faculty of Science and Technology, Department of Physics, University of Siegen, Walter Flex Str. 3, 57072 Siegen, Germany

A promising scheme to built scalable quantum simulators and computers is the separation of a larger system into smaller subsystems. A prerequisite for this divide and rule approach is the ability to transfer quantum information between subsystems. One possibilty to realize this for ion traps is the transport of ions carrying this information encoded to the internal state.

We report on the preserving of a superposition state of a ¹⁷¹Yb⁺ ion during movement in a microstructured Paul trap. The state is encoded in the hyperfine levels of the ion’s ground state. The shuttling potentials are calculated using a boundary element method simulation of the trap, adjusted for micromotion compensation and generated by an arbitary waveform generator [1] operated up to 12.5 MHz update rate. The fidelity per shuttling is determined by analysis of the contrast decay of a Ramsey type measurement with the shuttling procedure repeatedly executed during the free precession time. For a shuttling distance of 280 µm we observe a shuttling internal state fidelity better than 0.999.

[1] M. T. Baig, M. Johanning, A. Wiese, S. Heidbrink, M. Ziolkowski, Chr. Wunderlich, Rev. Sci. Instrum. 84, 124701 (2013).