title: Separating the classical and quantum information via quantum cloning.
abstract: An application of quantum cloning to optimally interface a quantum system with a classical observer is presented; in particular, we describe a procedure to perform a minimal disturbance measurement on a single qubit by adopting a 1-->2 cloning machine followed by a generalized measurement on a single clone and the anticlone or on the two clones. Such a scheme can be applied to enhance the transmission fidelity over a lossy quantum channel.
authors.affiliation: Dipartimento di Fisica and Istituto Nazionale per la Fisica della Materia, Università di Roma La Sapienza, piazzale A. Moro 5, Rome I-00185, Italy.
authors.forename: M
authors.initials: M
authors.lastname: Ricci
authors.forename: F
authors.initials: F
authors.lastname: Sciarrino
authors.forename: N J
authors.initials: NJ
authors.lastname: Cerf
authors.forename: R
authors.initials: R
authors.lastname: Filip
authors.forename: J
authors.initials: J
authors.lastname: Fiurásek
authors.forename: F
authors.initials: F
authors.lastname: De Martini