Two non-orthogonal states can be cloned by a unitary-reduction process
Lu-Ming Duan, Guang-Can Guo
Abstract
We show that, there are physical means for cloning two non-orthogonal pure states which are secretly chosen from a certain set % \= | Ψ0 > , | Ψ1 > $. The states are cloned through a unitary evolution together with a measurement. The cloning efficiency can not attain 100%. With some negative measurement results, the cloning fails.
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