Quantum Copying: Beyond the No-Cloning Theorem

Details Quantum Copying: Beyond the No-Cloning Theorem Quantum Copying: Beyond the No-Cloning Theorem

1996-07-20

arxiv.org/abs/quant-ph/9607018v1

Physics

Quantum Physics

RevTex, 26 pages, to appear in Physical Review A

Scientific paper

10.1103/PhysRevA.54.1844

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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