title: Realization of the quantum Toffoli gate with trapped ions.
abstract: Gates acting on more than two qubits are appealing as they can substitute complex sequences of two-qubit gates, thus promising faster execution and higher fidelity. One important multiqubit operation is the quantum Toffoli gate that performs a controlled NOT operation on a target qubit depending on the state of two control qubits. Here we present the first experimental realization of the quantum Toffoli gate in an ion trap quantum computer, achieving a mean gate fidelity of 71(3)%. Our implementation is particularly efficient as the relevant logic information is directly encoded in the motion of the ion string.
authors.affiliation: Institut für Experimentalphysik, Universität Innsbruck, Technikerstrasse 25, A-6020 Innsbruck, Austria.
authors.forename: T
authors.initials: T
authors.lastname: Monz
authors.forename: K
authors.initials: K
authors.lastname: Kim
authors.forename: W
authors.initials: W
authors.lastname: Hänsel
authors.forename: M
authors.initials: M
authors.lastname: Riebe
authors.forename: A S
authors.initials: AS
authors.lastname: Villar
authors.forename: P
authors.initials: P
authors.lastname: Schindler
authors.forename: M
authors.initials: M
authors.lastname: Chwalla
authors.forename: M
authors.initials: M
authors.lastname: Hennrich
authors.forename: R
authors.initials: R
authors.lastname: Blatt