Information transfer and fidelity in quantum copiers

Deuar, P. and Munro, W. J. (2000) Information transfer and fidelity in quantum copiers. Physical Review A, 61 6: 1-13. doi:10.1103/PhysRevA.61.062304

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Author Deuar, P.
Munro, W. J.
Title Information transfer and fidelity in quantum copiers
Journal name Physical Review A   Check publisher's open access policy
ISSN 1050-2947
1094-1622
Publication date 2000
Sub-type Article (original research)
DOI 10.1103/PhysRevA.61.062304
Open Access Status File (Publisher version)
Volume 61
Issue 6
Start page 1
End page 13
Total pages 13
Place of publication College Park, MD, United States
Publisher American Physical Society
Collection year 2000
Language eng
Abstract We find that very different quantum copying machines are optimal depending on the indicator used to assess their performance. Several quantum copying machine models acting on nonorthogonal input states are investigated, and assessed according to two types of criteria: transfer of (Shannon) information encoded in the initial states to the copies, and fidelity between the copies and the initial states. Transformations that optimize information transfer for messages encoded in qubits are found for three situations: (1) when the message is decoded one state at a time; (2) with simple schemes that allow the message to be encoded using block-coding schemes; and (3) when the copier produces independent copies. If the message is decoded one symbol at a time, information is best copied by a Wootters-Zurek copier.
Q-Index Code C1
Additional Notes Article #062304

Document type: Journal Article
Sub-type: Article (original research)
Collection: School of Physical Sciences Publications
 
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Created: Tue, 10 Jun 2008, 12:39:38 EST