Quantum cloning with an optical fiber amplifier.
It has been shown theoretically that a light amplifier working on the physical principle of stimulated emission should achieve optimal quantum cloning of the polarization state of light. We demonstrate close-to-optimal universal quantum cloning of polarization in a standard fiber amplifier for telecom wavelengths. For cloning 1-->2 we find a fidelity of 0.82, the optimal value being 5 / 6=0.83.
Fasel
Sylvain
S
Group of Applied Physics, University of Geneva, 20, rue de l'Ecole-de-Médecine, Switzerland.
Gisin
Nicolas
N
Ribordy
Grégoire
G
Scarani
Valerio
V
Zbinden
Hugo
H