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论文类型：期刊论文

发表时间：2008-12-01

发表刊物：PHYSICAL REVIEW A

收录刊物：SCIE、EI、Scopus

卷号：78

期号：6

ISSN号：1050-2947

关键字：quantum computing; quantum entanglement

摘要：A simple relation is introduced for concurrence to describe how much the entanglement of a bipartite system is at least left if either (or both) subsystem undergoes an arbitrary physical process. This provides a lower bound for concurrence of mixed states (pure states are included) in contrast to the upper bound given by Konrad [Nat. Phys. 4, 99 (2008)]. Our results are also suitable for general high-dimensional bipartite quantum systems.