, Volume 56, Issue 2, pp 271-275
Date: 06 Nov 2009

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

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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.