Complete deterministic linear optics Bell state analysis.
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.
Schuck
Carsten
C
Department für Physik, Ludwig-Maximilians-Universität, München, Germany.
Huber
Gerhard
G
Kurtsiefer
Christian
C
Weinfurter
Harald
H