Author： De Martini F. Sias C. Sciarrino F.
Publisher： Akademiai Kiado
ISSN： 1219-7580
Source： Acta Physica Hungarica A, Vol.20, Iss.1-2, 2004-01, pp. : 3-6
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Abstract
Many transformations which can be achieved without error on classical bit cannot be perfectly implemented on qubit, the quantum analogue of a bit, i.e. the fidelities of these processes have an upper bound. The machines that reach these bounds are called optimal. Here we report an experimental realization of two of these devices: the universal-NOT gate and the optimal quantum cloning of
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