Scheme for Entanglement Concentration of Unknown Multiparticle Greenberger–Horne–Zeilinger or W Class States
Song Wei · Communications in Theoretical Physics · 2007
We present two schemes for concentrating unknown nonmaximally entangled Greenberger–Horme–Zeilinger (GHZ) or W class states. The first scheme for concentrating the nonmaximally entangled GHZ state is based on linear optical devices. The second scheme for concentrating the W class states can be applied to a wide variety of atomic state. Both of our schemes are not postselection ones and are within the current technologies.