Purification of single-photon entanglement.
Single-photon entanglement is a simple form of entanglement that exists between two spatial modes sharing a single photon. Despite its elementary form, it provides a resource as useful as polarization-entangled photons and it can be used for quantum teleportation and entanglement swapping operations. Here, we report the first experiment where single-photon entanglement is purified with a simple linear-optics based protocol. In addition to its conceptual interest, this result might find applications in long distance quantum communication based on quantum repeaters.
Salart
D
D
Group of Applied Physics, University of Geneva, 20, Rue de l'Ecole de Médecine, CH-1211 Geneva 4, Switzerland.
Landry
O
O
Sangouard
N
N
Gisin
N
N
Herrmann
H
H
Sanguinetti
B
B
Simon
C
C
Sohler
W
W
Thew
R T
RT
Thomas
A
A
Zbinden
H
H