Journal
PHYSICAL REVIEW A
Volume 64, Issue 1, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevA.64.014301
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We present a realistic purification scheme for pure nonmaximally entangled states. In the scheme, two distant parties Alice and Bob first start with two shared but less entangled photon pairs to produce a conditional four-photon Greenberger-Horne-Zeilinger state, and then perform a 45 degrees polarization measurement onto one of the two photons at each location such that the remaining two photons are projected onto a maximally entangled state.
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