Universality of optimal measurements

Tarrach, Rolf and Vidal, Guifre (1999) Universality of optimal measurements. Physical Review a, 60 5: R3339-R3342. doi:10.1103/PhysRevA.60.R3339

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Author Tarrach, Rolf
Vidal, Guifre
Title Universality of optimal measurements
Journal name Physical Review a   Check publisher's open access policy
ISSN 1050-2947
1094-1622
Publication date 1999-11-01
Sub-type Article (original research)
DOI 10.1103/PhysRevA.60.R3339
Open Access Status File (Publisher version)
Volume 60
Issue 5
Start page R3339
End page R3342
Total pages 4
Place of publication College Park, MD, United States
Publisher American Physical Society
Language eng
Formatted abstract
We present optimal and minimal measurements on identical copies of an unknown state of a quantum bit when the quality of measuring strategies is quantified with the gain of information (Kullback—or mutual information—of probability distributions). We also show that the maximal gain of information occurs, among isotropic priors, when the state is known to be pure. Universality of optimal measurements follows from our results: using the fidelity or the gain of information, two different figures of merits, leads to exactly the same conclusions for isotropic distributions. We finally investigate the optimal capacity of N copies of an unknown state as a quantum channel of information.
Keyword Quantum
Information
Ensembles
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status Non-UQ

Document type: Journal Article
Sub-type: Article (original research)
Collection: School of Mathematics and Physics
 
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