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Optimal universal and state-dependent quantum cloning

Abstract:

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


DiVincenzo, DP More by this author
Macchiavello, C More by this author
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Journal:
Physical Review A - Atomic, Molecular, and Optical Physics
Volume:
57
Issue:
4
Pages:
2368-2378
Publication date:
1998-04-05
ISSN:
1050-2947
URN:
uuid:48dd0316-fe55-4613-88a6-050864b5823f
Source identifiers:
313241
Local pid:
pubs:313241
Language:
English

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