title: Quantum computation with unknown parameters.
abstract: We show how it is possible to realize quantum computations on a system in which most of the parameters are practically unknown. We illustrate our results with a novel implementation of a quantum computer by means of bosonic atoms in an optical lattice. In particular, we show how a universal set of gates can be carried out even if the number of atoms per site is uncertain.
authors.affiliation: Max-Planck-Institut für Quantenoptik, Hans-Kopfermann-Strasse 1, D-85748 Garching, Germany.
authors.forename: J J
authors.initials: JJ
authors.lastname: García-Ripoll
authors.forename: J I
authors.initials: JI
authors.lastname: Cirac