Quantum correlation swapping

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• 作者：Chuanmei Xie (1)
  Yimin Liu (2)
  Hang Xing (1)
  Jianlan Chen (1)
  Zhanjun Zhang (1)
  
  1. School of Physics and Material Science ; Anhui University ; Hefei ; 230039 ; Anhui ; China
  2. Department of Physics ; Shaoguan University ; Shaoguan ; 512005 ; China
  
• 关键词：Quantum correlation repeater ; Quantum correlation swapping ; Werner state ; Bipartite von Neumann measurement ; Four quantum correlation measures
• 刊名：Quantum Information Processing
• 出版年：2015
• 出版时间：February 2015
• 年：2015
• 卷：14
• 期：2
• 页码：653-679
• 全文大小：561 KB
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• 刊物类别：Physics and Astronomy
• 刊物主题：Physics
  Physics
  Mathematics
  Engineering, general
  Computer Science, general
  Characterization and Evaluation Materials
  
• 出版者：Springer Netherlands
• ISSN：1573-1332

文摘

Quantum correlations (QCs), including quantum entanglement and those different, are important quantum resources and have attracted much attention recently. Quantum entanglement swapping as a kernel technique has already been applied to quantum repeaters for successfully generating long-distance shared maximally entangled qubit states. Long-distance shared QCs containing shared entanglements are useful and important for some quantum information processing in future quantum networks. In this paper, the concept of quantum entanglement repeater is extended to that of QC repeater by generalizing quantum entanglement swapping to QC swapping. Specifically, the swapping of QCs in a pair of Werner states through a local bipartite von Neumann measurement is treated. Four different QC measures, i.e., entanglement of formation (William in Phys Rev Lett 80:2245, 1998), quantum discord (Ollivier and Zurek in Phys Rev Lett 88:017901, 2001), measurement-induced disturbance (MID) (Luo in Phys Rev A 77:022301, 2008) and ameliorated MID (Girolami et al. in J Phys A 44:352002, 2011), are employed to characterize and quantify QCs. Properties and thresholds of all QCs which occur in the swapping process are revealed, and two different phenomena are exposed and explained. It is found that a long-distance shared QC can be generated from two short-distance ones via QC swapping indeed; however, its amount cannot exceed the minimum one among the QCs in the two initial states and in the measuring state as far as the four quantifiers are concerned.