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It has been shown theoretically that a light amplifier working on thephysical principle of stimulated emission should achieve optimal quantumcloning of the polarization state of light. We demonstrate close-to-optimaluniversal quantum cloning of polarization in a standard fiber amplifier fortelecom wavelengths. For cloning 1 --> 2 we find a fidelity of 0.82, theoptimal value being 5/6 = 0.83.Comment: 4 pages, 3 figure

Quantum Cloning with an Optical Fiber Amplifier