Optimal universal quantum cloning and state estimation
We derive a tight upper bound for the fidelity of a universal N → M qubit cloner, valid for any M ≥ N, where the output of the cloner is required to be supported on the symmetric subspace. Our proof is based on the concatenation of two cloners and the connection between quantum cloning and quantum s...
| Main Authors: | , , |
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| Format: | Journal article |
| Language: | English |
| Published: |
1998
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