title: Experimental characterization of quantum dynamics through many-body interactions.
abstract: We report on the implementation of a quantum process tomography technique known as direct characterization of quantum dynamics applied on coherent and incoherent single-qubit processes in a system of trapped (40)Ca(+) ions. Using quantum correlations with an ancilla qubit, direct characterization of quantum dynamics reduces substantially the number of experimental configurations required for a full quantum process tomography and all diagonal elements of the process matrix can be estimated with a single setting. With this technique, the system's relaxation times T(1) and T(2) were measured with a single experimental configuration. We further show the first, complete characterization of single-qubit processes using a single generalized measurement realized through multibody correlations with three ancilla qubits.
authors: Institut für Experimentalphysik, Universität Innsbruck, Technikerstrasse 25, A-6020 Innsbruck, Austria.
authors: Daniel
authors: D
authors: Nigg
authors: Julio T
authors: JT
authors: Barreiro
authors: Philipp
authors: P
authors: Schindler
authors: Masoud
authors: M
authors: Mohseni
authors: Thomas
authors: T
authors: Monz
authors: Michael
authors: M
authors: Chwalla
authors: Markus
authors: M
authors: Hennrich
authors: Rainer
authors: R
authors: Blatt