https://doi.org/10.1140/epjd/e2009-00277-3
Linear optical scheme for entanglement concentration of two
partially entangled three-photon 
states
1
Center for the Condensed-Matter Science and Technology,
Harbin Institute of Technology, Harbin, 150001 Heilongjiang, P.R. China
2
Department of
Physics, College of Science, Yanbian University, Yanji,
133002 Jilin, P.R.
China
3
Department of Physics & BK21 Program for Device
Physics, College of Natural Science, Chungbuk National University,
Cheongju, 361-763 Chungbuk, Republic of Korea
Corresponding author: szhang@ybu.edu.cn
Received:
27
May
2009
Revised:
4
July
2009
Published online:
6
November
2009
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.
PACS: 03.67.-a – Quantum information / 42.50.-p – Quantum optics
© EDP Sciences, Società Italiana di Fisica, Springer-Verlag, 2009
