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论文类型：期刊论文

发表时间：2007-02-01

发表刊物：PHYSICAL REVIEW A

收录刊物：SCIE、EI

卷号：75

期号：2

ISSN号：1050-2947

摘要：Bounds on the concurrence of the superposition state in terms of the concurrences of the states being superposed are found in this paper. The bounds on concurrence are quite different from those on the entanglement measured by von Neumann entropy [Linden , Phys. Rev. Lett. 97, 100502 (2006)]. In particular, a nonzero lower bound can be provided if the states being superposed are properly constrained.