Linearly-independent quantum states can be cloned

@inproceedings{Duan1997LinearlyindependentQS,
  title={Linearly-independent quantum states can be cloned},
  author={Lu-Ming Duan and Guang-Can Guo},
  year={1997}
}
A fundamental question in quantum mechanics is, whether it is possible to replicate an arbitrary unknown quantum state. Then famous quantum no-cloning theorem [Nature 299, 802 (1982)] says no to the question. But it leaves open the following question: If the state is not arbitrary, but secretly chosen from a certain set $ = {|Ψ1〉 , |Ψ2〉 , · · · , |Ψn〉}, whether is the cloning possible? This question is of great practical significance because of its applications in quantum information theory. If… CONTINUE READING

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