Seminar über Quanten-, Atom- und Neutronenphysik (QUANTUM)

May 8, 2008 at 5 p.m. c.t. in Lorentz-Raum

Prof. Dr. Peter van Loock
Institut für Physik
loock@uni-mainz.de

Dr. Lars von der Wense
Institut für Physik
lars.vonderwense@uni-mainz.de

Quantum Information Processing with Ions
Prof. Dr. Ferdinand Schmidt-Kaler (Universität Ulm)


Superpositions of quantum logic states |0> und |1> are stored and manipulated in the electronic excitation of ions for a future quantum computer [1]. So far, we know how to deal with a single, two [2,3], and up to eight qubits. For a realization of a scalable quantum device we employ linear segmented micro-structured Paul-traps [4].

As alternative to Paul traps, ions may be confined in the matrix of a solid state crystal. While quantum gate operations have been demonstrated for two of such qubits [5], no scalable solid state devices have been fabricated. We have proposed a method which uses a linear Paul trap a deterministic source of sympathetically cooled doping ions [6]. Recently, we have proven experimentally deterministic extraction of cold ions.

[1] J. I. Cirac und P. Zoller, Phys. Rev. Lett. 74, 4091(1995).
[2] F. Schmidt-Kaler et al., Nature 422, 408 (2003).
[3] D. Leibfried et al., Nature 422, 412 (2003).
[4] S. Schulz, et al., New Journal of Physics (2008), arXiv:0712.3249
[5] T. Gaebel et al., Nature Physics 2, 408 (2006).
[6] J. Meijer, et. al. , Appl. Phys. A 83, 321 (2006).