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论文类型：期刊论文

发表时间：2008-12-22

发表刊物：PHYSICS LETTERS A

收录刊物：SCIE、Scopus

卷号：373

期号：1

页面范围：58-60

ISSN号：0375-9601

关键字：Fidelity; Purity; Mixed states

摘要：We give an alternative definition of quantum fidelity for two density operators on qudits in terms of their Hilbert-Schmidt inner product and their purity. It can be regarded as the well-defined operator fidelity for the two operators and satisfies all Jozsa's four axioms up to a normalization factor. This fidelity is not computationally demanding. (C) 2008 Elsevier B.V. All rights reserved.