title: Noiseless Conditional Teleportation of a Single Photon.
abstract: We experimentally demonstrate the noiseless teleportation of a single photon by conditioning on quadrature Bell measurement results near the origin in phase space and thereby circumventing the photon loss that otherwise occurs even in optimal gain-tuned continuous-variable quantum teleportation. In general, thanks to this loss suppression, the noiseless conditional teleportation can preserve the negativity of the Wigner function for an arbitrary pure input state and an arbitrary pure entangled resource state. In our experiment, the positive value of the Wigner function at the origin for the unconditional output state, W(0,0)=0.015±0.001, becomes clearly negative after conditioning, W(0,0)=-0.025±0.005, illustrating the advantage of noiseless conditional teleportation.
authors.affiliation: Department of Applied Physics, School of Engineering, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-8656, Japan.
authors.forename: Maria
authors.initials: M
authors.lastname: Fuwa
authors.affiliation: Department of Applied Physics, School of Engineering, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-8656, Japan.
authors.forename: Shunsuke
authors.initials: S
authors.lastname: Toba
authors.affiliation: Department of Applied Physics, School of Engineering, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-8656, Japan.
authors.forename: Shuntaro
authors.initials: S
authors.lastname: Takeda
authors.affiliation: Department of Optics, Palacký University, 17. listopadu 1192/12, 77146 Olomouc, Czech Republic.
authors.forename: Petr
authors.initials: P
authors.lastname: Marek
authors.affiliation: Department of Optics, Palacký University, 17. listopadu 1192/12, 77146 Olomouc, Czech Republic.
authors.forename: Ladislav
authors.initials: L
authors.lastname: Mišta
authors.affiliation: Department of Optics, Palacký University, 17. listopadu 1192/12, 77146 Olomouc, Czech Republic.
authors.forename: Radim
authors.initials: R
authors.lastname: Filip
authors.affiliation: Institute of Physics, Staudingerweg 7, Johannes Gutenberg-Universität Mainz, 55099 Mainz, Germany.
authors.forename: Peter
authors.initials: P
authors.lastname: van Loock
authors.affiliation: Department of Applied Physics, School of Engineering, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-8656, Japan.
authors.forename: Jun-Ichi
authors.initials: JI
authors.lastname: Yoshikawa
authors.affiliation: Department of Applied Physics, School of Engineering, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-8656, Japan.
authors.forename: Akira
authors.initials: A
authors.lastname: Furusawa