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论文类型：期刊论文

发表时间：2008-08-01

发表刊物：CHINESE PHYSICS B

收录刊物：SCIE、EI、CSCD、Scopus

卷号：17

期号：8

页面范围：2795-2799

ISSN号：1674-1056

关键字：entanglement measure; tripartite entanglement; quantum phase transition

摘要：A new simplified formula is presented to characterize genuine tripartite entanglement of (2 circle times 2 circle times n)-dimensional quantum pure states. The formula turns out equivalent to that given in (Quant. Inf. Comp. 7(7) 584 (2007)), hence it also shows that the genuine tripartite entanglement can be described only on the basis of the local (2 0 2)-dimensional reduced density matrix. In particular, the two exactly solvable models of spin system studied by Yang (Phys. Rev. A 71 030302(R) (2005)) are reconsidered by employing the formula. The results show that a discontinuity in the first derivative of the formula or in the formula itself of the ground state just corresponds to the existence of quantum phase transition, which is obviously different from the concurrence.