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论文类型：期刊论文

发表时间：2009-02-16

发表刊物：PHYSICS LETTERS A

收录刊物：SCIE

卷号：373

期号：7

页面范围：727-730

ISSN号：0375-9601

关键字：Entanglement measure; Monogamy; Tripartite entanglement

摘要：We present an interesting monogamy equation for (2 circle times 2 circle times n)-dimensional pure states, by which a quantity is found to characterize the tripartite entanglement with the GHZ type and W type entanglements as a whole. In particular, we, for the first time, reveals that for any quantum state of a pair of qubits, the difference between the two remarkable entanglement measures, concurrence and negativity, characterizes the W type entanglement of tripartite pure states with the two-qubit state as reduced density. (C) 2009 Elsevier B.V. All rights reserved.