Detection of entanglement with polarized photons: experimental realization of an entanglement witness.
We report on the first experimental realization of an entanglement witness, a method to detect entanglement with few local measurements. The present demonstration has been performed with polarized photons in Werner states, a well-known family of mixed states that can be either separable or nonseparable. The Werner states are generated by a novel high brilliance source of bipartite entangled states by which the state mixedness can be easily adjusted.
Barbieri
M
M
Dipartimento di Fisica and Istituto Nazionale per la Fisica della Materia, Università di Roma La Sapienza, 00185 Rome, Italy.
De Martini
F
F
Di Nepi
G
G
Mataloni
P
P
D'Ariano
G M
GM
Macchiavello
C
C