Stuttgart 2012 – wissenschaftliches Programm

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Q: Fachverband Quantenoptik und Photonik

Q 47: Quanteninformation: Atome und Ionen 2

Q 47.4: Vortrag

Donnerstag, 15. März 2012, 14:45–15:00, V7.02

Fast transport operations in a segmented ion trap quantum computer — •Andreas Walther, Ulrich Poschinger, Konstantin Ott, Michael Schnorr, Sam Dawkins, Kilian Singer, Frank Ziesel, Max Hettrich, and Ferdinand Schmidt-Kaler — QUANTUM, Inst. für Physik, Univ. Mainz, Staudinger Weg 7, 55128 Mainz

For scalable quantum information processing in ion traps, two essential types of operations have to be performed in a combined way: i) shuttling operations of ions between different segments of the trap and ii) quantum logic operations. In addition, it is important that these operations are performed as fast as possible, such that many operations can be made before decoherence and heating effects set in. Here we experimentally demonstrate the realization of very fast shuttling of ions between segments. An ion, cooled near to its motional ground state, is transported more than 300 µm within only a few cycles of its harmonic oscillation period. With properly chosen parameters, the ion can be made to remain in the vibrational ground state after the transport. We also report on a fast cooling scheme, utilizing continuous near resonant Raman interactions for a combination of single and two photon processes that is able to cool ions close to their motional ground state. For multiple-ion crystals, this scheme represents a particular advantage, allowing for the possibility of cooling multiple motional modes at once, which yields fast cooling times in the order of 100 µs.