期刊
INTERNATIONAL JOURNAL OF QUANTUM INFORMATION
卷 7, 期 5, 页码 1009-1019出版社
WORLD SCIENTIFIC PUBL CO PTE LTD
DOI: 10.1142/S0219749909005584
关键词
Metrics between quantum states; entropy; purification
类别
资金
- CONICET
We study in detail a very natural metric for quantum states. This new proposal has two basic ingredients: entropy and purification. The metric for two mixed states is defined as the square root of the entropy of the average of representative purifications of those states. Some basic properties are analyzed and its relation to other distances is investigated. As an illustrative application, the proposed metric is evaluated for one-qubit mixed states.
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