Optimal universal and state-dependent quantum cloning

Journal article

We establish the best possible approximation to a perfect quantum cloning machine that produces two clones out of a single input. We analyze both universal and state-dependent cloners. The maximal fidelity of cloning is shown to be 5/6 for universal cloners. It can be achieved either by a special unitary evolution or by a teleportation scheme. We construct the optimal state-dependent cloners operating on any prescribed two non-orthogonal states and discuss their fidelities and the use of auxi...

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Authors: Bruß, D; DiVincenzo, D; Ekert, A; Fuchs, C; Macchiavello, C

• Journal: Physical Review A - Atomic, Molecular, and Optical Physics
• Volume: 57
• Issue: 4
• Pages: 2368-2378
• Publication date: 1998-04-01
• ISSN: 1050-2947
• Language: English