Arbitrary Four-Photon Cluster State Concentration with Cross-Kerr Nonlinearity

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• 作者：Yu-Bo Sheng (1) (3)
  Sheng-Yang Zhao (1) (3)
  Jiong Liu (1) (3)
  Xing-Fu Wang (2)
  Lan Zhou (1) (2)
  
  1. Key Lab of Broadband Wireless Communication and Sensor Network Technology ; Ministry of Education ; Nanjing University of Posts and Telecommunications ; Nanjing ; 210003 ; People鈥檚 Republic of China
  3. Institute of Signal Processing Transmission ; Nanjing University of Posts and Telecommunications ; Nanjing ; 210003 ; People鈥檚 Republic of China
  2. College of Mathematics & Physics ; Nanjing University of Posts and Telecommunications ; Nanjing ; 210003 ; People鈥檚 Republic of China
  
• 关键词：Entanglement concentration ; Cluster state ; Cross ; Kerr nonlinearity
• 刊名：International Journal of Theoretical Physics
• 出版年：2015
• 出版时间：April 2015
• 年：2015
• 卷：54
• 期：4
• 页码：1292-1303
• 全文大小：437 KB
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• 刊物类别：Physics and Astronomy
• 刊物主题：Physics
  Physics
  Quantum Physics
  Elementary Particles and Quantum Field Theory
  Mathematical and Computational Physics
  
• 出版者：Springer Netherlands
• ISSN：1572-9575

文摘

We describe an entanglement concentration protocol (ECP) for arbitrary four-photon less-entangled cluster state. The ECP works with the help of quantum nondemolition (QND) measurement and conventional photon detectors. In our ECP, an arbitrary less-entangled four-photon cluster state can be concentrated in two steps. Moreover, in both concentration steps, the discarded states can be reused to obtain a higher success probability. This protocol may be useful in current one-way quantum computation.