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.
Félix Bussières, Christoph Clausen, Alexey Tiranov, Boris Korzh, Varun B. Verma, Sae Woo Nam, Francesco Marsili, Alban Ferrier, Philippe Goldner, Hartmut Herrmann, Christine Silberhorn, W. Sohler, Mikael Afzelius, Nicolas Gisin
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