Experimental purification of single qubits.
We report the experimental realization of the purification protocol for single qubits sent through a depolarizing channel. The qubits are associated with polarization states of single photons and the protocol is achieved by means of passive linear optical elements. The present approach may represent a convenient alternative to the distillation and error correction protocols of quantum information.
Ricci
M
M
Dipartimento di Fisica and Istituto Nazionale per la Fisica della Materia, Università di Roma La Sapienza, p.le A. Moro 5, Roma I-00185, Italy.
De Martini
F
F
Cerf
N J
NJ
Filip
R
R
Fiurásek
J
J
Macchiavello
C
C