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Characterization of Fast Ion Transport via Position-Dependent Optical Deshelving
Ion transport is an essential operation in some models of quantum information
processing, where fast ion shuttling with minimal motional excitation is
necessary for efficient, high-fidelity quantum logic. While fast and cold ion
shuttling has been demonstrated, the dynamics and specific trajectory of an ion
during diabatic transport have not been studied in detail. Here we describe a
position-dependent optical deshelving technique useful for sampling an ion's
position throughout its trajectory, and we demonstrate the technique on fast
linear transport of a ion in a surface-electrode ion trap.
At high speed, the trap's electrode filters strongly distort the transport
potential waveform. With this technique, we observe deviations from the
intended constant-velocity (100 m/s) transport: we measure an average speed of
83(2) m/s and a peak speed of 251(6) m/s over a distance of 120