title: Local transformation of two einstein-podolsky-rosen photon pairs into a three-photon w state.
abstract: We propose and experimentally demonstrate a transformation of two Einstein-Podolsky-Rosen photon pairs distributed among three parties into a three-photon W state using local operations and classical communication. We then characterize the final state using quantum state tomography on the three-photon state and on its marginal bipartite states. The fidelity of the final state to the ideal W state is 0.778+/-0.043 and the expectation value for its witness operator is -0.111+/-0.043 implying the success of the proposed local transformation.
authors.affiliation: Graduate School of Engineering Science, Osaka University, Toyonaka, Osaka 560-8531, Japan. tashima@qi.mp.es.osaka-u.ac.jp
authors.forename: Toshiyuki
authors.initials: T
authors.lastname: Tashima
authors.forename: Tetsuroh
authors.initials: T
authors.lastname: Wakatsuki
authors.forename: Sahin Kaya
authors.initials: SK
authors.lastname: Ozdemir
authors.forename: Takashi
authors.initials: T
authors.lastname: Yamamoto
authors.forename: Masato
authors.initials: M
authors.lastname: Koashi
authors.forename: Nobuyuki
authors.initials: N
authors.lastname: Imoto