title: Using qubits to measure fidelity in mesoscopic systems.
abstract: We point out the similarities in the definition of the "fidelity" of a quantum system and the generating function determining the full counting statistics of charge transport through a quantum wire and suggest to use flux or charge qubits for their measurement. As an application we use the notion of fidelity within a first-quantized formalism in order to derive new results and insights on the generating function of the full counting statistics.
authors.affiliation: L.D. Landau Institute for Theoretical Physics RAS, 117940 Moscow, Russia.
authors.forename: G B
authors.initials: GB
authors.lastname: Lesovik
authors.forename: F
authors.initials: F
authors.lastname: Hassler
authors.forename: G
authors.initials: G
authors.lastname: Blatter