Controlling fast transport of cold trapped ions
  We realize fast transport of ions in a segmented micro-structured Paul trap. The ion is shuttled over a distance of more than 10^4 times its groundstate wavefunction size during only 5 motional cycles of the trap (280 micro meter in 3.6 micro seconds). Starting from a ground-state-cooled ion, we find an optimized transport such that the energy increase is as low as 0.10 $\pm$ 0.01 motional quanta. In addition, we demonstrate that quantum information stored in a spin-motion entangled state is preserved throughout the transport. Shuttling operations are concatenated, as a proof-of-principle for the shuttling-based architecture to scalable ion trap quantum computing. 
Andreas Walther, Frank Ziesel, Thomas Ruster, Sam T. Dawkins,   Konstantin Ott, Max Hettrich, Kilian Singer, Ferdinand Schmi...
physics.atom-ph quant-ph