title: Complete deterministic linear optics Bell state analysis.
abstract: We show how hyperentanglement allows us to deterministically distinguish between all four polarization Bell states of two photons. In this proof-of-principle experiment, we employ the intrinsic time-energy correlation of photon pairs generated with high temporal definition in addition to the polarization entanglement obtained from parametric down-conversion. For the identification, no nonlinear optical elements or auxiliary photons are needed. The new possibilities this complete Bell measurement offers are demonstrated by realizing an optimal dense coding protocol.
authors.affiliation: Department für Physik, Ludwig-Maximilians-Universität, München, Germany.
authors.forename: Carsten
authors.initials: C
authors.lastname: Schuck
authors.forename: Gerhard
authors.initials: G
authors.lastname: Huber
authors.forename: Christian
authors.initials: C
authors.lastname: Kurtsiefer
authors.forename: Harald
authors.initials: H
authors.lastname: Weinfurter