Journal
PHYSICAL REVIEW A
Volume 66, Issue 6, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevA.66.064301
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An experimental scheme for preparing a polarization entangled W states from four photons emitted by parametric down-conversion is,proposed. We consider two different configurations and a method of improving, the yield by using single-photon sources. In the proposed scheme, one uses only linear optical elements and, photon detectors, so that this scheme is feasible by current technologies.
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