Quantum Information

The European Physical Journal D

, Volume 56, Issue 2, pp 271-275

Linear optical scheme for entanglement concentration of two partially entangled three-photon \({\sf W}\) states

  • H. F. WangAffiliated withCenter for the Condensed-Matter Science and Technology, Harbin Institute of Technology
  • , S. ZhangAffiliated withCenter for the Condensed-Matter Science and Technology, Harbin Institute of TechnologyDepartment of Physics, College of Science, Yanbian University Email author 
  • , K. H. YeonAffiliated withDepartment of Physics & BK21 Program for Device Physics, College of Natural Science, Chungbuk National University

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Abstract

We propose a practical scheme for concentrating entanglement in a pair of unknown partially entangled three-photon W states with only linear optics and photon detectors. In the scheme, Alice, Bob, and Charlie at three distant parties can obtain one maximally entangled three-photon W state with a certain success probability from two identical partially entangled three-photon W states by local operations and classical communication. The proposed setup is very simple, which greatly simplifies the experimental realization of the scheme.