title: Teleportation of a vacuum--one-photon qubit.
abstract: We report the experimental realization of teleporting a one-particle entangled qubit. The qubit is physically implemented by a two-dimensional subspace of states of a mode of the electromagnetic field, specifically, the space spanned by the vacuum and the one-photon state. Our experiment follows the line suggested by Lee and Kim [Phys. Rev. A 63, 012305 (2000)] and Knill, Laflamme, and Milburn [Nature (London) 409, 46 (2001)]. An unprecedented large value of the teleportation "fidelity" has been attained: F = (95.3 +/- 0.6)%.
authors.affiliation: Istituto Nazionale di Fisica della Materia, Dipartimento di Fisica, Università La Sapienza, Roma, 00185 Italy.
authors.forename: Egilberto
authors.initials: E
authors.lastname: Lombardi
authors.forename: Fabio
authors.initials: F
authors.lastname: Sciarrino
authors.forename: Sandu
authors.initials: S
authors.lastname: Popescu
authors.forename: Francesco
authors.initials: F
authors.lastname: De Martini