Local transformation of two EPR photon pairs into a three-photon W state

Tashima, Toshiyuki; Wakatsuki, Tetsuroh; Ozdemir, Sahin Kaya; Yamamoto, Takashi; Koashi, Masato; Imoto, Nobuyuki

Local transformation of two EPR photon pairs into a three-photon W state

Authors

Description

We propose and experimentally demonstrate a transformation of two EPR 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 $0.778\pm 0.043$ and the expectation value for its witness operator is $-0.111\pm 0.043$ implying the success of the proposed local transformation.
5 pages, 5 figures