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Quantum Copying: Beyond the No-Cloning Theorem

Vladimir Buzek·Mark Hillery
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Abstract

We analyze to what extent it is possible to copy arbitrary states of a two-level quantum system. We show that there exists a "universal quantum copying machine", which approximately copies quantum mechanical states in such a way that the quality of its output does not depend on the input. We also examine a machine which combines a unitary transformation with a selective measurement to produce good copies of states in a neighborhood of a particular state. We discuss the problem of measurement of the output states.

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Vladimir Buzek, Mark Hillery. 1996-07-20. Quantum Copying: Beyond the No-Cloning Theorem. https://doi.org/10.1103/physreva.54.1844

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