Optimal Quantum Cloning Machines

Details Optimal Quantum Cloning Machines Optimal Quantum Cloning Machines

1997-05-27

arxiv.org/abs/quant-ph/9705046v2

Phys.Rev.Lett.79:2153-2156,1997

Physics

Quantum Physics

4 pages, Latex, 1 postscript figure, (very) minor modifications

Scientific paper

10.1103/PhysRevLett.79.2153

We present Quantum Cloning Machines (QCM) that transform N identical qubits into $M>N$ identical copies and we prove that the fidelity (quality) of these copies is optimal. The connection between cloning and measurement is discussed in detail. When the number of clones M tends towards infinity, the fidelity of each clone tends towards the optimal fidelity that can be obtained by a measurement on the input qubits. More generally, the QCM are universal devices to translate quantum information into classical information.

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