Vortrag: Quantum information processing and quantum control with trapped ions, 9.6.2009, 13:00 Uhr

08 Jun 2009 by in Studium

Im Rahmen des Berufungsverfahrens für die Professur aus Angewandter Quantenphysik hält Dietrich LEIBFRIED vom National Institute of Standards and Technology (NIST), Boulder, Colorado, USA einen Vortrag zum Thema "Quantum information processing and quantum control with trapped ions".

Dieser Vortrag findet am Dienstag, 9.6.2009 um 13:00 Uhr im Hörsaal des Atominstitutes der österreichischen Universitäten (Stadionalle 2, 1020 Wien) statt.


This talk will give an overview of different aspects of quantum engineering with trapped ions at NIST.

By simultaneous manipulation of two different ion species, single qubit rotations, two-qubit
gates, transport in a linear trap array and sympathetic re-cooling we were able to prepare an
entangled state of two spatially separate harmonic oscillators and to implement repeated one
and two-qubit gates with interspersed transport. These experiments constitute the most
complete demonstration of building blocks towards a scalable architecture for quantum
information processing with trapped ions to date. Moreover, we demonstrated ion transport
through trap array junctions in a two-layer and a micro-fabricated surface electrode trap. We
are also working on implementing quantum logic by oscillating magnetic fields and their
gradients with the goal of improving scalability and fidelity of gate operations.

Moreover, trapped ions offer exciting prospects for quantum simulation and quantum limited
sensors. In collaboration with R. Schmid (MPQ Garching) and J. Wesenberg (U. Oxford) we
proposed new methods to implement quantum spin models in arrays of trapped ions. In
collaboration with R. Maiwald and G. Leuchs (U. Erlangen) we demonstrated a “stylus” trap
geometry that might enable detection of very weak (zepto-Newton) forces or, in combination
with a deep parabolic mirror, enable coupling of the trapped ion to a single mode fiber with
near unit efficiency. The latter application could potentially improve protocols for entangling
ions, atoms or quantum dots by interference of spontaneously emitted photons without
resorting to enhanced emission into optical cavities.

Eine Zusammenfassung ist auch auf der Webseite des Atominstituts zu finden: http://www.ati.ac.at/fileadmin/files/general/Vortraege/BerufungsvortragAngewQuantenphysik_Leibfried.pdf


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Topic revision: r1 - 08 Jun 2009, waliddPHYSIKFHTUFAT

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