Journal article icon

Journal article

Optimal universal quantum cloning and state estimation

Abstract:

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 state estimation. We generalize the operation of a quantum cloner to mixed and/or entangled input qubits described by a density matrix supported on the symmetric subspace of the constituent qubits. ...

Expand abstract

Actions


Authors


Macchiavello, C More by this author
Journal:
Physical Review Letters
Volume:
81
Issue:
12
Pages:
2598-2601
Publication date:
1998
ISSN:
0031-9007
URN:
uuid:e6010f01-6d67-4bf9-a779-89824b8d48e6
Source identifiers:
313239
Local pid:
pubs:313239
Language:
English

Terms of use


Metrics



If you are the owner of this record, you can report an update to it here: Report update to this record

TO TOP