title: Teleportation and dense coding with genuine multipartite entanglement.
abstract: We present an explicit protocol E0 for faithfully teleporting an arbitrary two-qubit state via a genuine four-qubit entangled state. By construction, our four-partite state is not reducible to a pair of Bell states. Its properties are compared and contrasted with those of the four-party Greenberger-Horne-Zeilinger and W states. We also give a dense coding scheme D0 involving our state as a shared resource of entanglement. Both D0 and E0 indicate that our four-qubit state is a likely candidate for the genuine four-partite analogue to a Bell state.
authors.affiliation: Department of Physics, National University of Singapore, 10 Kent Ridge Crescent, Singapore 119260, Singapore.
authors.forename: Ye
authors.initials: Y
authors.lastname: Yeo
authors.forename: Wee Kang
authors.initials: WK
authors.lastname: Chua