Phys. Rev. A 71, 050302(R) (2005) [4 pages]Long-distance entanglement swapping with photons from separated sources
We report the experimental realization of entanglement swapping over long distances in optical fibers. Two photons separated by more than 2 km of optical fibers are entangled, although they never directly interacted. We use two pairs of time-bin entangled qubits created in spatially separated sources and carried by photons at telecommunication wavelengths. A partial Bell-state measurement is performed with one photon from each pair, which projects the two remaining photons, formerly independent onto an entangled state. A visibility high enough to infer a violation of a Bell inequality is reported, after both photons have each traveled through 1.1 km of optical fiber. © 2005 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevA.71.050302
DOI:
10.1103/PhysRevA.71.050302
PACS:
03.67.Hk, 42.50.Dv, 42.81.−i
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