Journal article
Optimal universal quantum cloning and state estimation
- Abstract:
- We derive a tight upper bound for the fidelity of a universal N to M qubit cloner, valid for any M \geq 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 generalise 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. We also extend the validity of optimal state estimation methods to inputs of this kind.
- Publication status:
- Published
- Peer review status:
- Peer reviewed
Actions
Access Document
- Files:
-
-
(Preview, pdf, 102.7KB, Terms of use)
-
- Publisher copy:
- 10.1103/PhysRevLett.81.2598
Authors
- Publisher:
- American Physical Society
- Journal:
- Physical Review Letters More from this journal
- Volume:
- 81
- Issue:
- 12
- Pages:
- 2598-2601
- Publication date:
- 1997-12-01
- DOI:
- EISSN:
-
1079-7114
- ISSN:
-
0031-9007
- Keywords:
- Pubs id:
-
pubs:313235
- UUID:
-
uuid:b7b93469-6800-428c-bbc8-b16abde5a5d9
- Local pid:
-
pubs:313235
- Source identifiers:
-
313235
- Deposit date:
-
2013-03-20
- ARK identifier:
Terms of use
- Copyright holder:
- American Physical Society
- Copyright date:
- 1997
- Notes:
- Dagmar Bruss, Artur Ekert, and Chiara Macchiavello; Physical Review Letters v.81:issue.12, pp2598-2601 (1998). Copyright 1998 American Physical Society.
If you are the owner of this record, you can report an update to it here: Report update to this record